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Spencer Li

What is the CPI (Consumer Price Index) and How to Trade it?

Markets & Products
Trading the CPI release - market news

What Is the CPI (Consumer Price Index), and How Do Traders Use It?

Last updated: 8 October 2026 · By Spencer Li, CFTe


The Consumer Price Index (CPI) is a monthly measure of the average change in prices that consumers pay for a fixed basket of goods and services, and it is the number traders watch most closely to read inflation. It is published by a national statistics agency (in the US, the Bureau of Labor Statistics), and the year-over-year change in the CPI is what people mean when they say “the inflation rate.” For traders, the CPI matters for one reason above all others: it shapes what the central bank does with interest rates. A hotter-than-expected CPI tends to push rate expectations up, which usually pressures stocks and bonds. A cooler-than-expected CPI tends to do the opposite. The single most useful number in the report is not the headline figure itself but how it lands versus the forecast, and that is the part most beginners miss.

Here is what the CPI is, how it is built, the numbers inside the report, and how traders actually use it on release day.

Markets move on the surprise, not the level. Summary card for the post: What is the CPI (Consumer Price Index) and How to Trade it?.

What is the CPI, and where did it come from?

The Consumer Price Index measures the average change over time in the prices paid by consumers for a basket of everyday goods and services. Divide this period’s basket price by an earlier period’s, and you get a measure of how much the cost of living has moved. When the index rises, your money buys less. That loss of purchasing power is inflation.

The CPI has been around longer than most people assume. The US Bureau of Labor Statistics (BLS) started collecting price data in the late 19th century. It was formally tasked with calculating the CPI in 1918, and the first official US CPI was published in 1919. Today most countries run their own version, and it remains the standard yardstick for inflation, purchasing power, and the cost of living.

How is the CPI calculated?

The CPI comes from a statistical survey. The agency builds a basket of goods and services meant to represent what a typical household actually buys, then tracks the prices of those items over time. The basket is refreshed periodically as spending habits change, so it does not get stuck measuring things nobody buys anymore.

The calculation runs in five steps:

  1. Select the basket. Choose goods and services that represent typical consumer spending.
  2. Collect price data. Sample prices at regular intervals (usually monthly) from retail outlets, service providers, and rental markets.
  3. Weight the prices. Give each item importance based on how much of the household budget it eats up. Housing carries far more weight than apparel, because people spend far more on it.
  4. Calculate the average. Combine the weighted prices into a single basket price.
  5. Calculate the inflation rate. Compare that basket price across periods. The percentage change is the inflation rate.

Do note that the CPI is only one way to measure inflation. Two others you will see referenced are the Producer Price Index (PPI), which tracks prices at the wholesale/producer level rather than the consumer level, and the GDP Deflator, which covers the whole economy’s output. They tell slightly different stories, which is why a sharp reading often cross-checks them.

What are the key numbers in the CPI report?

The release is not one number. It is a stack of them, and knowing which line moved tells you where the inflation is coming from. Here are the main figures, what each one measures, and why a trader cares.

NumberWhat it measuresWhy a trader watches it
Headline CPIAverage price change across the full basketThe marquee figure; sets the first market reaction
Core CPICPI excluding food and energyStrips out the volatile stuff; central banks lean on this for the underlying trend
Inflation ratePercentage change in CPI over a period (usually year-over-year)The “is inflation rising or cooling” read
Food and beverage indexPrices of food and drinksVolatile component; can swing headline without changing the trend
Energy indexGasoline, electricity, heating oilThe other volatile component; oil shocks show up here first
Housing indexRent, owners’ equivalent rent, shelterThe heaviest-weighted component; slow-moving but dominant
Transportation indexGasoline, motor vehicle insurance, public transitMixes energy and services
Medical care indexHospital, physician, prescription drug pricesA persistent, sticky-services read
Apparel indexClothing and footwearSmall weight; rarely the story

The reason core CPI (the headline number minus food and energy) gets so much attention is that food and energy prices jump around for reasons that have nothing to do with broad inflation, like a cold snap or an oil supply shock. Strip them out and you see the underlying trend more clearly. That is why a central bank, and a sharp trader, will often watch core more closely than the headline.

How do traders and investors use CPI data?

The CPI matters to markets through one main channel: interest rates. Inflation erodes the value of money, so when it runs hot, central banks tend to raise rates to cool it down. Higher rates tend to slow spending and growth, which is generally a headwind for stocks and bonds. When inflation runs cold, central banks can cut rates to encourage spending, which is generally a tailwind.

So traders read the CPI as a clue about the central bank’s next move. Rising, hotter inflation points toward higher rates ahead. Cooling inflation points toward steady or lower rates. From there, traders adjust positioning, lean their bias for stocks and bonds, and decide on the timing and size of trades around the release.

Here is the part that trips up beginners. The market does not react to whether inflation is high or low in absolute terms. It reacts to the number versus what was already expected. A high CPI that everyone forecast is mostly priced in already. The move comes from the surprise, the gap between the actual print and the consensus forecast. This is the one rule to internalize before you ever trade a release.

Two bars, forecast and actual CPI; the part of the actual bar above the forecast is red and labelled surprise
Markets move on the gap between the CPI print and the forecast, not the level.

News trading on CPI: what actually happens at the release

On release day, two figures do most of the work: the headline CPI and the core CPI (excluding food and energy). Traders compare both against the consensus forecast and gauge the surprise, then map that to a rate expectation. Here is the simplified cheat sheet.

CPI versus forecastWhat it signalsTypical first reaction
Hotter than expectedInflation is a concern; central bank may hikeRisk-off: stocks and bonds tend to fall
In line with forecastStory unchanged; surprise is smallMuted; the move is usually small
Cooler than expectedInflation easing; central bank may hold or cutRisk-on: stocks and bonds tend to rise

Personally, I do not trade the first violent seconds of a CPI print, and I would gently steer a new trader away from it too. The spreads blow out, the initial spike often reverses, and you are competing with machines that read the number in milliseconds. The cleaner edge is in the hours and days after, once the market has digested the surprise and a real direction settles in. The release is the catalyst. Your job is to trade the move it sets up.

This is where the human edge lives. A data feed will deliver the CPI number to a thousand traders at the exact same instant, and a bot will price the surprise before you have finished reading the second decimal. What the feed will not do is tell you to sit on your hands through the first whipsaw, size the trade for a volatile release, or skip the day entirely because the surprise was too small to bother with. The number is free. The judgment about whether to act on it is the part worth learning, and it is the first of the Five Edges no algorithm can trade for you.

Should you add the CPI to your trading toolbox?

For most traders, yes, but as context rather than a trigger. The CPI is one of the cleanest reads you have on inflation and, by extension, on what the central bank is likely to do next. Even if you never trade the release itself, knowing whether inflation is running hot or cooling helps you understand why the market is doing what it is doing. That context is worth far more than chasing one volatile number once a month.

FAQ

What is the CPI in simple terms?
The Consumer Price Index measures the average change in the prices of a basket of everyday goods and services that consumers buy. The year-over-year change in the CPI is what people call the inflation rate.

Why does the CPI move the stock market?
Because it shapes interest-rate expectations. A hotter-than-expected CPI raises the odds of rate hikes, which tends to pressure stocks and bonds. A cooler-than-expected CPI does the opposite. The reaction comes from the surprise versus forecast.

What is the difference between headline CPI and core CPI?
Headline CPI covers the full basket. Core CPI excludes food and energy, which are volatile and can swing the headline for reasons unrelated to broad inflation. Central banks lean on core to read the underlying trend.

Is the CPI the same as the inflation rate?
Not quite. The CPI is the index (a price level). The inflation rate is the percentage change in that index over a period, usually a year. The inflation rate is derived from the CPI.

How is the CPI different from the PPI?
The CPI measures prices at the consumer level. The Producer Price Index (PPI) measures prices at the producer or wholesale level, earlier in the supply chain. PPI moves can sometimes hint at where CPI is heading.


So, is the CPI something you will add to your own trading toolbox, or do you prefer to stay out of the way on release day? Let me know in the comments.

And if you want the full framework for trading scheduled economic releases, read the pillar: The Trader’s Guide to News and Economic-Data Trading.

Want a system that does not depend on calling the next CPI? Grab the free 15-Minute Swing Trading Starter Kit. It is the exact routine I use to scan once a day and trade any market in 15 minutes, no economic-calendar gambling required.


About the author. Spencer Li is The 15-Minute Trader and the founder of Synapse Trading. He is a Certified Financial Technician (CFTe) with 15+ years of trading, run from 70+ countries. He holds a B.Acc and B.BM from SMU. Every trade he takes is public, dated, losses left in. He teaches rules-based swing trading in 15 minutes a day, one system for any market.

Education, not financial advice. Synapse Trading is not licensed by MAS to advise on investment products. Trading carries risk of loss; past performance is not indicative of future results.


Related

The Trader’s Guide to News and Economic-Data Trading · How to trade the NFP (Non-Farm Payrolls) report · What is the FOMC (Federal Open Market Committee) Meeting and How to Trade it?

by Spencer Li
https://synapsetrading.com/wp-content/uploads/2026/10/cpi-consumer-price-index-card.webp 630 1200 Spencer Li https://synapsetrading.com/wp-content/uploads/2026/10/synapse-logo-horizontal-light.png Spencer Li2023-02-08 18:25:132026-10-26 16:55:49What is the CPI (Consumer Price Index) and How to Trade it?
Spencer Li

What Does NFP Mean? The Non-Farm Payroll Report, Explained for Traders

Markets & Products
What NFP means for traders - market news

What Does NFP Mean? The Non-Farm Payroll Report, Explained for Traders

By Spencer Li, CFTe · Last updated: 11 September 2026

NFP stands for Non-Farm Payroll. It is the monthly count of how many jobs the US economy added or lost, published by the US Bureau of Labor Statistics (BLS) in a report called the Employment Situation. It counts almost every paid job in the country, government jobs included, and leaves out farm workers, the self-employed and people employed by private households.

The report usually comes out on the first Friday of the month at 8:30am New York time, which is 8:30pm in Singapore for most of the year and 9:30pm from November to mid-March.

For a few seconds after it lands, it is probably the most-watched number in finance. Stocks, bonds, gold and the US dollar can all jump in the same minute, because jobs drive spending, spending drives inflation, and inflation decides what the Federal Reserve does with interest rates.

It took me years to really appreciate that the market barely reacts to the number itself. It reacts to the surprise. That is how far the number lands from what economists expected, and once the idea clicks, most of what happens on NFP night starts to make sense.

Trade the surprise, not the NFP number. Summary card for the post: What Does NFP Mean? The Non-Farm Payroll Report, Explained for Traders.

What happens when the jobs report does not show up?

The easiest way to show how much the market leans on this one report is to tell you about the month it went missing.

In October 2025, the US government shut down because Congress had not passed its funding. The BLS is a government agency, so it stopped work along with everyone else. The October jobs report never came out. The household survey for that month was never even collected. The BLS has said it will not be collected afterwards either, so America’s job data now has a permanent gap where October 2025 should be.

I talked about this in my weekly outlook at the time, because the market did something quite strange. With no jobs report and very little other data coming out, traders had nothing to argue about, and the market just kept slowly creeping up. It turns out that a market with nothing to argue about is a fairly calm place.

When the delayed November report finally arrived on 16 December, traders suddenly had two months of payroll numbers to digest at once, and the arguments came back right on schedule.

So the NFP matters for two reasons, and only one of them is the data. The other is that the whole market uses it as a shared scoreboard. When the scoreboard disappears, everyone is left trading on guesswork.

Where does the NFP number come from?

The BLS builds the report from two separate surveys. It helps to know which number comes from which, because the two can tell quite different stories in the same month.

The first is the establishment survey, also called the payroll survey. Every month the BLS asks about 119,000 businesses and government agencies, covering roughly 622,000 worksites, how many people they paid in the pay period that includes the 12th of the month. The headline NFP number, the one flashing on every screen at 8:30pm, comes from here.

The second is the household survey, which works more like a small census, asking about 60,000 households who at home is working and who is out of work but still looking. That is where the unemployment rate comes from.

Because one survey asks employers and the other asks families, you can get a month where payrolls look strong while the household survey looks soft, and the debate on financial TV that night is mostly about which survey to believe. The payroll survey gets the headline because its sample is so much bigger, but a household survey that keeps disagreeing month after month is usually worth a closer look.

Both surveys are also seasonally adjusted. The BLS strips out the patterns that repeat every year, like shops hiring extra staff for Christmas and letting them go in January, so that what you see is the underlying trend rather than the calendar.

If you trade around a full-time job, you do not need to follow every survey to use this report. My free trading guides are a better place to start.

What are the five numbers inside the report?

Most people only ever hear the headline. The report actually carries five numbers, and in some months the headline turns out to be the least important of them.

NumberWhat it measuresA hotter-than-expected reading usually means
Non-farm payrollsJobs added or lost against last monthThe economy is growing and the US dollar firms
Unemployment rateShare of the labour force out of work and lookingA falling rate makes rate cuts less likely
Average hourly earningsPay per hour across payroll workersInflation worry rises, bond yields rise, stocks can fall
Participation rateShare of adults working or looking for workMore people are coming back into the job market
Average workweekHours worked per weekFirms need more hours from the staff they already have

To give you a sense of how big these numbers can get, the largest monthly fall in the history of the data came in April 2020. As the pandemic closed down whole industries, payrolls dropped by 20.5 million in a single month, and the unemployment rate jumped to 14.7%. No month since has fallen anywhere near that far.

Why does the surprise matter more than the number?

If you grew up in Singapore, you already understand this from results day in school. A B is good news if everyone expected you to get a C. It becomes a very different conversation at the dinner table if everyone expected an A. The grade is exactly the same, and the reaction depends entirely on what people expected.

The NFP works the same way. Before every release, economists publish a forecast, usually called the consensus, and you can see it for free on any economic calendar. Here is a made-up example with round numbers.

Say the consensus is 150,000 new jobs, and the report shows 90,000.

That is a miss of 60,000 jobs, or 40% below the forecast, and the market will usually move hard.

Now say that next month the consensus is 150,000 again, and the report shows 160,000. That is a beat of only 10,000, or about 7%, and the market barely blinks, even though 160,000 is a perfectly healthy number for the US economy.

So what you are really trading on NFP night is the gap between the number and the forecast. The number is the grade, the consensus is the expectation, and the price move is the conversation at the dinner table.

Two jobs reports against the same forecast line: one far below it, with the gap marked in red as the surprise, and one just above it
The market trades the gap between the NFP number and the forecast, not the number itself.

Why can good jobs news be bad for stocks?

This is the part that confuses most new traders, and I watched it play out again in June 2026. The jobs report came in good, and the market fell anyway, because people read a strong report as a sign that the Fed would hold off on cutting rates.

On a normal day, more jobs should be good for stocks, because more people working means more spending, more spending means more company profits, and profits are what stocks are priced on in the end.

But suppose the economy is already running hot and inflation is the thing everyone is worried about. Now a strong jobs number, especially with fast wage growth behind it, tells the Fed it has no reason to cut rates, and it may even need to raise them. Higher rates make borrowing more expensive for companies and households, and they make bonds look better against stocks. So the same news that feels like a win for the economy can send stocks lower.

Hence, before every release, I find it useful to ask what the market is actually afraid of right now. When the fear is a recession, a strong report brings relief. When the fear is inflation, the same strong report becomes a threat. The number is the same either way. Only the fear has changed.

Reading the market’s fear is a habit. Habits are easier to keep with a routine, and my free trading guides are where I would start building one.

Why do the revisions matter as much as the headline?

The NFP is one of the few numbers in finance that is allowed to change its mind. Every report also revises the two months before it, because more businesses send in their numbers late. Sometimes the revision is the story.

The clearest recent example came on 1 August 2025. The report showed only 73,000 jobs added in July, and in the same release the BLS revised May and June down by a combined 258,000 jobs. Later that day, the President fired the commissioner of the BLS.

I am not taking a side on the politics here. For a trader, the lesson is that a strong headline paired with a big cut to the previous months can read as a weak report overall. So it is always worth scrolling past the first number before deciding what the report is really saying.

Should you trade the NFP release itself?

On 1 August 2025, a trader on Reddit’s r/Daytrading asked a fair question: “Should NFP week be avoided or just the day?” The post went up about 16 minutes before the July report, which then arrived with 258,000 jobs revised away, so the timing was better than most.

For a swing trader, my answer is neither. The danger sits in the minutes around the release, not in the whole week, and as for trading the release itself, I would not start a beginner there. In the first few minutes after the release, spreads widen and price often spikes one way before reversing the other, and plenty of stops get hit on both sides of the same candle.

For most swing traders, the NFP works much better as context than as a trigger. I think of it as the Trigger, Context or Sit-out call, and the important thing is to make it before the release, never in the middle of it.

  1. Trigger. Trade the release itself. It is fast and expensive in spreads, and it suits professionals with tight execution far more than it suits someone trading after work.
  2. Context. Let the report tell you which regime you are in, whether the economy is heating up or cooling down, and then take clean setups in the days after, well away from the release minute.
  3. Sit out. Cut size before the number and step away from the screen. In Singapore it lands at dinner time, which makes this one surprisingly easy.

My own trading plan says to close or reduce positions before major news like the NFP, and to let the report shape the swing trades I take afterwards. That is really a mix of Sit out and Context.

That rule does not keep me off the market on NFP Friday. My own records show it. As at March 2026, counting from June 2024, 25 of the 475 closed trades in my public trade log were opened on an NFP release day, each sized at 10% of capital. Of those 25, 13 were winners, a 52% hit rate against 50% on every other day in the log. So NFP Friday was neither lucky nor unlucky for me. It was a Friday with more noise.

FAQ

What does NFP stand for?
NFP stands for Non-Farm Payroll. It is the monthly US jobs number from the Bureau of Labor Statistics, counting the jobs added or lost across the economy outside farming.

What time is the NFP released in Singapore?
It is released at 8:30pm Singapore time during US daylight saving, which runs from March to early November, and at 9:30pm the rest of the year. That is 8:30am in New York.

Does the NFP include government jobs?
Yes. It counts federal, state and local government employees. It leaves out farm workers, the self-employed and private household staff.

Why was there no NFP report for October 2025?
The US government shutdown stopped the BLS from working, so no October 2025 report was published. The household survey for that month was never collected, and the payroll figures came out late, with the November report on 16 December 2025.

Is a high NFP number good or bad for stocks?
It depends on what the market fears. In a growth scare, a strong number helps. When inflation is the worry, a strong number with fast wage growth can push stocks down, because it lowers the odds of a rate cut.

Which NFP number matters most?
The headline payroll number, in most months. When inflation is the worry, average hourly earnings can matter more, and the revisions to earlier months can change the whole read.


Which of the three calls do you usually make on NFP night, and has a jobs report ever caught you by surprise? Let me know in the comments.

For more on building a trading routine, start with my free trading guides. The inflation report works in a very similar way, and I cover it in What is the CPI.


About the author. Spencer Li is The 15-Minute Trader and the founder of Synapse Trading. He is a Certified Financial Technician (CFTe) with 15+ years of trading, run from 70+ countries. He holds a B.Acc and B.BM from SMU. Every trade he takes is public, dated, losses left in. He teaches rules-based swing trading in 15 minutes a day, one system for any market.

Education, not financial advice. Synapse Trading is not licensed by MAS to advise on investment products. Trading carries risk of loss, and past performance is not indicative of future results.

by Spencer Li
https://synapsetrading.com/wp-content/uploads/2026/10/nfp-nonfarm-payroll-card.webp 630 1200 Spencer Li https://synapsetrading.com/wp-content/uploads/2026/10/synapse-logo-horizontal-light.png Spencer Li2023-02-03 12:38:132026-10-26 16:55:52What Does NFP Mean? The Non-Farm Payroll Report, Explained for Traders
Spencer Li

Book Summary: Fortune’s Formula by William Poundstone

Trading Foundations
Fortune's Formula, summarised - book summary

Fortune’s Formula by William Poundstone: the Kelly Criterion, and How Traders Actually Use It

Last updated: 25 August 2026 · By Spencer Li, CFTe


Fortune’s Formula by William Poundstone is the story of the Kelly criterion, a formula that tells you how much of your money to bet on a single opportunity to grow your bankroll fastest over the long run without going broke. John Kelly, a physicist at Bell Labs, published it in 1956. The book traces how it travelled from information theory to blackjack tables (Edward Thorp), to Wall Street, and into the hands of gamblers and investors. The core idea is simple: bet a fraction of your capital that scales with your edge. The bigger your advantage and the better your odds, the more you commit. No edge, no bet.

The practical formula for an even-money bet is f = p − q, where f is the fraction of your bankroll to stake, p is your probability of winning, and q (which is 1 − p) is your probability of losing. For payouts that are not even money, it becomes f = (bp − q) / b, where b is the odds received (your reward-to-risk). For traders, the takeaway is not the algebra. It is this: size is a function of edge, and most people who blow up were not wrong about the trade, they were wrong about the size.

Here is what the book actually teaches, and how to use Kelly without it destroying your account.

Size is a function of edge. No edge, no bet. Summary card for the post: Book Summary: Fortune's Formula by William Poundstone.

What is the Kelly criterion?

The Kelly criterion is a position-sizing rule. It answers one question: given an edge, what fraction of my capital maximises the long-term growth rate of my bankroll?

Most people size by feel. They bet big when they feel confident and small when they are scared, which usually means biggest right before the loss that hurts most. Kelly replaces the feeling with a number. You feed in your win probability and your payout, and it returns the stake that grows your money fastest over a long series of bets.

The important word is long-term growth, not expected value. You can have a positive-expectation bet and still go broke if you size it too big, because one bad streak wipes you out before the math has time to work. Kelly is the line that separates “growing as fast as possible” from “growing, but flirting with ruin.” Bet more than full Kelly and your long-run growth actually goes down while your risk goes up. That is the part most people miss.

Long-run growth rises with bet size up to a peak at full Kelly, then falls when you bet more than that
Bet more than full Kelly and your long-run growth goes down while your risk goes up.

The story behind the book

John L. Kelly Jr. published the formula in 1956 in a Bell Labs paper on information theory. He was not trying to beat casinos. He was working on the rate at which information can be transmitted over a noisy line, and the same math turned out to describe how fast a gambler with an edge should grow a bankroll.

The person who carried it into the real world was Edward Thorp, the mathematician who used it to beat blackjack (the Beat the Dealer story) and later ran a hedge fund on the same principle. Poundstone follows the formula from Bell Labs to Las Vegas to Wall Street, with a cast that includes Claude Shannon (the father of information theory), mob-connected bookmakers, and the academics who spent decades arguing about whether Kelly was genius or recklessness.

William Poundstone is a science writer and journalist who studied physics at MIT and has written for The New York Times, Harper’s and Harvard Business Review. He is also the author of Priceless: The Myth of Fair Value. Fortune’s Formula is his best-known book and Amazon’s editors named it their top nonfiction pick of 2005.

A worked example: how Kelly sizing works in practice

Say you have a setup that wins 55% of the time and pays you 1-to-1 (you risk one unit to make one unit). Plug it in:

f = (bp − q) / b = (1 × 0.55 − 0.45) / 1 = 0.10

Full Kelly says bet 10% of your bankroll on that trade. On a $10,000 account, that is $1,000 of risk. To most traders, that is a terrifyingly large number, and that reaction is correct. Full Kelly is the maximum growth size, and it comes with brutal drawdowns. A run of bad luck at 10% per trade will cut your account in half and barely register as unusual.

That is why almost nobody trades full Kelly. They trade a fraction of it.

Full Kelly vs fractional Kelly

SizingStake on the example aboveLong-run growthDrawdown / ruin riskWho uses it
Full Kelly10% of bankrollFastest, in theorySevere, swings of 50%+ are normalAlmost nobody, in practice
Half Kelly5% of bankroll~75% of full Kelly’s growthRoughly half the drawdownMany professionals
Quarter Kelly2.5% of bankrollSlower but smoothLowConservative / uncertain-edge traders

The reason half Kelly is so popular is the trade-off it offers. You give up only about a quarter of your growth rate but you cut your drawdowns roughly in half. For a real human with a real stomach and a real career, that is a far better deal than chasing the theoretical maximum.

There is a deeper reason to size down too. Full Kelly assumes you know your edge exactly. You do not. Your “55% win rate” is an estimate from a finite sample, and it is probably optimistic. When your inputs are uncertain, betting the full Kelly fraction on a wrong number can put you above full Kelly on the real number, which is the worst place to be. Sizing down is your margin of safety against your own estimation error.

The formula gives you the ceiling. Your job is to stay comfortably under it.

How traders actually apply Kelly

You do not need to plug numbers into the equation before every trade. The useful part of Kelly is the principle, and it shows up in a few concrete habits:

  • Size scales with edge. A high-conviction setup with a strong reward-to-risk gets more capital than a marginal one. Same trader, same account, different size, because the edge is different.
  • No edge, no bet. If you cannot state why you have an advantage, Kelly says the optimal stake is zero. That is the formula telling you to stand aside.
  • Risk a fixed small fraction of your account. Risking 1% to 2% of your account per trade is, in effect, a conservative fractional-Kelly rule. As your account grows or shrinks, your position size moves with it.
  • Better odds and bigger edge both raise the size, but the size is capped. Even a great setup gets a ceiling, because a string of “great” setups can still lose in a row.

The thing Kelly protects you from is the single most common way traders die: being right about direction and wrong about size. You can have a genuine edge and still go to zero by betting too much of it on each trade. Kelly is the math that says exactly how much is too much.

Where the human edge comes in

A spreadsheet will compute the Kelly fraction in a second. What it will not do is tell you that your 55% win rate is really 51% once you stop cherry-picking your sample, or that you are about to override your own sizing rule because the last three trades won and you feel invincible. The formula is the easy part. Sizing honestly, against an edge you have not flattered, and holding that size when your gut is screaming to do otherwise, is the discipline. That is the discipline and sizing edge, one of the Five Edges no formula trades for you.

Should you read Fortune’s Formula?

Yes, if you want the story and the intuition behind position sizing. It is a narrative book. You will finish it understanding why sizing matters and where the idea came from, with a cast of memorable characters along the way. What it will not give you is a step-by-step trading manual, you have to translate the principle into your own rules yourself.

I would put it on the shelf next to the practical risk-and-sizing material. Read it for the why, then build your own fractional-Kelly rule for the how.

FAQ

What is the Kelly criterion in simple terms?
It is a formula that tells you what fraction of your money to bet on an opportunity to grow your bankroll fastest over the long run without risking ruin. The bigger your edge and the better your odds, the larger the fraction. With no edge, the optimal bet is zero.

What is the Kelly criterion formula?
For an even-money bet it is f = p − q, where p is your win probability and q is your loss probability. For non-even payouts it is f = (bp − q) / b, where b is the reward-to-risk odds. The result, f, is the fraction of your bankroll to stake.

Why do professionals use fractional Kelly instead of full Kelly?
Full Kelly gives the fastest theoretical growth but produces severe drawdowns and assumes you know your edge exactly. Half Kelly keeps about 75% of the growth while roughly halving the drawdown, and it leaves a safety margin for the fact that your edge is only an estimate.

Who wrote Fortune’s Formula and what is it about?
William Poundstone, a science writer and journalist. The book tells the history of the Kelly criterion, from John Kelly at Bell Labs through Edward Thorp’s use of it to beat blackjack and run a hedge fund, and how the same math applies to gambling and investing.

Can the Kelly criterion be used for stock trading?
Yes, as a position-sizing principle rather than a precise formula. Most traders apply it as a conservative fractional version, risking a small fixed percentage of the account per trade, and sizing up only when the edge and reward-to-risk genuinely justify it.


Now that you have the formula and the half-Kelly trade-off, the real question is the one most people skip: what is your honest edge, before you flatter it? Get that number right and the sizing takes care of itself. Let me know in the comments how you size your trades.

And if you want the wider reading list this book sits on, see the pillar: Best Investing and Trading Books of All Time.

Want the system the sizing plugs into? Grab the free 15-Minute Swing Trading Starter Kit. It is the exact routine I use to scan once a day and trade any market in 15 minutes, sizing included.


About the author. Spencer Li is The 15-Minute Trader and the founder of Synapse Trading. He is a Certified Financial Technician (CFTe) with 15+ years of trading, run from 70+ countries. He holds a B.Acc and B.BM from SMU. Every trade he takes is public, dated, losses left in. He teaches rules-based swing trading in 15 minutes a day, one system for any market.

Education, not financial advice. Synapse Trading is not licensed by MAS to advise on investment products. Trading carries risk of loss; past performance is not indicative of future results.


Related

Best Investing and Trading Books of All Time · Position sizing and risk management · The Five Edges

by Spencer Li
https://synapsetrading.com/wp-content/uploads/2026/10/fortunes-formula-william-poundstone-card.webp 630 1200 Spencer Li https://synapsetrading.com/wp-content/uploads/2026/10/synapse-logo-horizontal-light.png Spencer Li2023-01-28 18:52:072026-10-22 13:21:20Book Summary: Fortune’s Formula by William Poundstone
Spencer Li

Book Summary: Forex Price Action Scalping by Bob Volman

Trading Foundations
Scalping forex price action - book summary

Forex Price Action Scalping by Bob Volman: Book Summary and Review

Last updated: 19 October 2026 · By Spencer Li, CFTe


“Forex Price Action Scalping” by Bob Volman is a practical, no-fluff manual for trading forex on very short timeframes using raw price action, no lagging indicators, on a tight bid-ask spread. It is best for traders who already know the basics and want a disciplined, repeatable scalping method, not for beginners or anyone uneasy with fast, high-pressure decisions. The core message is honest: scalping (taking many small, quick profits on tiny price moves) is a real skill, not a shortcut, and it asks for sharp focus, strong risk control, and emotional discipline most people underestimate. Volman teaches you to read the chart itself (support, resistance, the round number, the false break) rather than chase signals. My short verdict: a genuinely good book if scalping is the game you want to play, and a useful read even if it is not, because the price-action thinking carries over. Just go in knowing scalping is one of the harder paths in trading.

Candles fall to a round-number level, one pokes below it with a long red wick, fails, and price reverses back up
Volman reads the chart itself, like a false break at a round number, not indicator signals.

Here is what the book covers, what is worth keeping, and who should actually read it.

Scalping is a real skill, not a shortcut. Summary card for the post: Book Summary: Forex Price Action Scalping by Bob Volman.

Who is Bob Volman?

Bob Volman is an independent trader who trades for his own account, and he is widely respected for his work on price action (reading the chart’s own movement instead of relying on indicators). He trades and teaches a pure, discretionary style, and his books are treated as serious reference material by price-action traders. When a working scalper sits down to write out exactly how he reads a 70-tick chart, it is worth a careful read.

What is the book about?

The book is a complete walkthrough of one thing done well: scalping forex with price action.

It starts at the basics (what scalping is, how to read price action) and builds toward a full method, with specific setups, entry and exit rules, and a heavy focus on risk and mindset. Volman does not sell it as easy money. The main message is the opposite: scalping is potentially profitable but genuinely demanding, and it only works if you bring the right skills, knowledge, and discipline. That honesty is the best thing about the book.

10 key ideas from the book

These are the takeaways I would underline if I were reading it again.

  1. Reading market structure and price action is the foundation. Trends, support and resistance, and chart patterns come first, before anything else.
  2. Indicators are a supplement to price action. His only indicator is a 20-period EMA; the price action leads.
  3. Discipline and risk management are non-negotiable. Stop-loss orders and strict limits on capital at risk per trade are what keep you in the game.
  4. The psychology is the hard part. Controlling your emotions and holding discipline under pressure is harder than spotting the setup.
  5. Leverage cuts both ways. It can magnify profits and losses in equal measure, so use it with caution.
  6. Scalping demands total focus. You need to read charts fast and decide in real time, with no room to drift.
  7. You trade specific, defined setups. Success comes from identifying and trading defined chart patterns and price-action setups.
  8. A robust trading plan is built in advance. That plan must include risk rules and a clear plan for managing losses before they happen.
  9. Stick to the plan and avoid impulsive trades. Discipline means following your own rules even when the screen tempts you.
  10. Keep learning and adapting. Markets shift, and the scalper has to keep adjusting to current conditions.

How do you apply the teachings?

A book is only useful if it changes what you do at the screen. Here is how to put Volman’s ideas to work.

  • Trade defined chart patterns and price-action setups you can define in advance.
  • Build in risk management from the start: stop-loss orders and position sizing on every trade.
  • Write a trading plan, then actually follow it.
  • Practise discipline and emotional control as a skill, the same way you practise the setups.
  • Keep learning and adapt to current market conditions.
  • Use indicators alongside price action to refine entries and exits.
  • Cap the capital at risk on each trade, and let the stop-loss enforce it.
  • Train yourself to spot trends, support and resistance, and patterns quickly.
  • Treat leverage with respect, and know its dangers before you size up.
  • Build the speed to analyse a chart and decide in real time.

The honest catch: scalping is capital-hungry and high-pressure

There are a few things Volman is upfront about that I want to repeat, because they are the parts people skip.

Scalping aims at very small price moves, so the math only works at size. That means it tends to need a larger amount of capital, and the same leverage that lifts the profit lifts the loss. The potential for gains is matched, bar for bar, by the potential for losses.

And it is not for everyone. If you are not comfortable with fast, high-pressure, screen-glued decision-making, scalping will grind on you. There is no shame in that. Knowing it is not your style is itself a useful conclusion to reach from reading the book.

Should you read it? A quick decision table

You are…Read it?Why
A complete beginnerLaterStrong price-action foundations help first; the scalping detail will overwhelm you
An intermediate trader wanting a defined methodYesThis is the sweet spot: a complete, rules-based scalping system to study
A swing or position traderOptional, but usefulYou will not scalp, but the price-action reading (false breaks, round numbers, support/resistance) transfers cleanly
Someone who hates fast, high-pressure tradingProbably notThe method demands real-time focus you may not want to live in daily
Looking for easy, passive returnsNoScalping is one of the more demanding paths

Where the human edge comes in

Here is the part I keep coming back to. A platform can plot every level, flag every round number, and even auto-mark a clean false break for you. The reading is getting cheaper every year. What no tool hands you is the discipline to size the trade, the patience to skip the marginal setup, and the emotional control to take the stop without flinching. Volman spends as much ink on mindset as on setups for exactly this reason. The chart pattern is the easy part. Trading it like a professional is the judgment, and that is the first of the Five Edges no scanner can trade for you.

My take

Personally, I rate this book highly within its lane. It is honest, specific, and it teaches you to read the chart rather than worship an indicator, which is a habit that pays off whatever timeframe you end up trading. I do not personally scalp as my main game, I prefer rules-based swing trading where I can scan once a day and act calmly. But I still got value from how clearly Volman lays out price-action reading, and I would recommend it to any intermediate trader who is curious about short timeframes. Just keep your eyes open about the capital and the pressure it asks for.

FAQ

Is “Forex Price Action Scalping” by Bob Volman good for beginners?
Not as a first book. It is best for intermediate traders with some forex knowledge. A complete beginner should build price-action foundations first, then come back to the scalping detail.

What is forex price action scalping?
It is a style of trading forex on very short timeframes (Volman uses a 70-tick chart) by reading raw price action, support, resistance, round numbers, and false breaks, to take many small, quick profits, without relying on lagging indicators.

Do you need a lot of capital to scalp?
Generally yes. Scalping targets very small price moves, so the strategy tends to need more capital to be worthwhile, and the leverage that boosts profits boosts losses just as much.

Is the price-action method in the book useful if I do not want to scalp?
Yes. The way Volman reads charts (false breaks, round numbers, support and resistance) carries over to swing and position trading, even if you never trade a 70-tick setup.

Is scalping profitable?
It can be, but it is one of the more demanding styles. It requires sharp focus, strict risk management, and emotional discipline, and the potential for losses matches the potential for gains. It is a skill, and skills take practice.


Now that you have the summary, would you add this one to your reading list? And if you have already read it, what stuck with you most? Let me know in the comments.

If you want the wider shortlist, read the pillar: Best Investing and Trading Books of All Time.

Want a calmer way to trade than scalping? Grab the free 15-Minute Swing Trading Starter Kit, the exact routine I use to scan once a day and trade any market in 15 minutes.


About the author. Spencer Li is The 15-Minute Trader and the founder of Synapse Trading. He is a Certified Financial Technician (CFTe) with 15+ years of trading, run from 70+ countries. He holds a B.Acc and B.BM from SMU. Every trade he takes is public, dated, losses left in. He teaches rules-based swing trading in 15 minutes a day, one system for any market.

Education, not financial advice. Synapse Trading is not licensed by MAS to advise on investment products. Trading carries risk of loss; past performance is not indicative of future results.


Related

Best Investing and Trading Books of All Time · Trading in the Zone by Mark Douglas (review) · Understanding Price Action by Bob Volman (summary) · Reminiscences of a Stock Operator (review) · Definitive Guide to Price Chart Patterns

by Spencer Li
https://synapsetrading.com/wp-content/uploads/2026/10/forex-price-action-scalping-bob-volman-card.webp 630 1200 Spencer Li https://synapsetrading.com/wp-content/uploads/2026/10/synapse-logo-horizontal-light.png Spencer Li2023-01-28 18:52:022026-10-28 15:34:41Book Summary: Forex Price Action Scalping by Bob Volman
Spencer Li

Book Summary: Following the Trend by Andreas Clenow

Trading Foundations
Following the trend, summarised - book summary

“Following the Trend” by Andreas Clenow: Book Summary, Key Ideas, and Who Should Read It

Last updated: 24 August 2026 · By Spencer Li, CFTe


“Following the Trend: Diversified Managed Futures Trading” by Andreas Clenow is a practical guide to systematic trend following, the strategy of using futures contracts across many markets to ride large price moves in either direction. Clenow, CIO and partner of ACIES Asset Management in Zurich, and formerly Reuters’ Global Head of Equity and Commodity Quant Modelling, walks you through how managed futures actually work, why diversification across markets is the engine of the whole approach, and how to evaluate performance honestly using metrics like the Sharpe ratio and drawdown. The core thesis is simple: prices in different markets tend to trend, and a diversified, rules-based system that follows those trends can be a valuable addition to a portfolio. The catch is that it requires real understanding and the stomach for long, painful drawdowns. Personally, I rate it as one of the clearest, least hyped books on the subject. It is best for traders and portfolio managers who want the mechanics of trend following, not beginners looking for a first trading book.

Here is what the book teaches, the ideas worth keeping, and who should actually read it.

Diversification is the strategy, not a garnish. Summary card for the post: Book Summary: Following the Trend by Andreas Clenow.

What is “Following the Trend” about?

The book explains the ins and outs of managed futures (a strategy that trades futures contracts to bet on the direction of price moves across stocks, bonds, currencies, and commodities). Clenow covers the types of contracts typically used, the benefits and risks of the approach, and how to build a diversified portfolio that incorporates trend following.

What makes it useful is that he does not stop at theory. He shows real-world examples of strategies he has used himself, walks through the mathematics behind trend following, and is honest about where it goes wrong. The main message is that managed futures can earn a real place in a diversified portfolio, but only if you understand the market and the strategies underneath it.

This is not a get-rich book. It is a how-the-machine-works book.

Who is Andreas Clenow?

Andreas Clenow is CIO and partner of ACIES Asset Management in Zurich, and formerly Reuters’ Global Head of Equity and Commodity Quant Modelling. He has over 20 years of experience in the industry, has been a frequent speaker at industry conferences, and has been interviewed and quoted across several financial publications.

That background matters for how you read the book. Clenow writes from inside a real fund, not from the sidelines, so the risk-management and portfolio-construction chapters carry weight that a purely academic treatment would not.

The 10 key ideas, in one table

I find a book like this is easier to hold in your head as a list of claims than as prose. Here are the ten ideas that do the heavy lifting, and why each one matters.

#Key ideaWhy it matters
1Managed futures uses futures contracts to bet on the direction of price moves across many marketsIt is directional and systematic, not a stock-picking exercise
2Prices in different markets tend to trend, and following those trends can be profitableThis is the entire thesis the strategy rests on
3The book covers contract types, benefits, risks, and how to build a diversified portfolioGives you the full mechanics, not just the highlights
4Clenow shows real strategies he has used successfully himselfGrounds the theory in a practitioner’s actual book
5Risk management is central, and you need a defined plan before you tradeTrend following lives or dies on how you control losses
6Diversification across markets is what mitigates riskSpreading across uncorrelated markets is the core engine
7He maps the managed futures industry and the players in itContext for where your strategy sits in the wider market
8The book examines performance over time and how to evaluate strategiesTeaches you to judge a system, not just admire its returns
9He compares fund types, including commodity trading advisers (CTAs)Helps you choose the right vehicle for your goals
10It closes on the future of managed futures, its opportunities and challengesFrames the strategy as evolving, not a finished answer

A few of these deserve a closer look.

Diversification is the strategy, not a garnish

The single most important idea in the book is that diversification across many markets is not a nice-to-have. It is the engine. A trend follower wins because, across dozens of uncorrelated markets, a few large trends pay for the many small losses. Run the same system on one or two markets and you have removed the thing that makes it work.

A grid of thirty small market charts: most chop sideways in grey while three trend strongly up or down in red
Across dozens of markets, a few big trends pay for the many small losses.

Risk management before returns

Clenow spends real time on setting up a risk-management plan, because trend following produces long stretches of small losses while you wait for the big trends. Without a plan that sizes positions sensibly and caps your exposure, the drawdowns will shake you out before the payoff arrives.

Judge a system by more than its returns

The book teaches you to evaluate performance with metrics like the Sharpe ratio (return per unit of volatility), drawdown (the peak-to-trough fall in your account), and the information ratio. The point is that a headline return tells you almost nothing on its own. How much pain you took to earn it is the real story.

How to actually apply it

The book gives you a clear set of moves to put the ideas to work. Distilled, they come down to this:

  • Research different trend-following strategies and funds, and pick one that fits your goals and risk tolerance.
  • Build a diversified portfolio that pairs managed futures with other types of investments.
  • Learn the contracts and markets used, and the specific risks and benefits of each.
  • Write a risk-management plan before you put money on, then size positions to it.
  • Monitor the portfolio regularly and adjust as market conditions change.

Do note that, Clenow is blunt on one point worth repeating: past performance is not a guarantee of future results, and managed futures can be volatile. The drawdowns are real, and they are long.

Where the human edge comes in

A modern platform can backtest a trend-following system in seconds and show you a gorgeous equity curve. That part is close to free now. What it will not do is sit you in the chair through an 18-month drawdown without flinching, or stop you from abandoning the system at the exact moment it is about to work. The rules are the easy part. The discipline to hold position sizing steady and follow the system through the ugly stretches is the hard part, and that is the human edge a backtest can never trade for you.

Should you read it? My honest take

Personally, I would put this on the shelf for anyone serious about systematic trading, but I would not hand it to a complete beginner. It assumes you are comfortable with the idea of futures, position sizing, and reading a performance table. If you have that footing, it is one of the clearest, least hyped books on trend following you can buy, precisely because Clenow writes from inside a real fund and does not dress up the drawdowns.

If you are still picking your first trading book, start elsewhere and come back to this one once the basics are second nature.

For more book picks in the same vein, see our roundup of the best investing and trading books of all time, and if you want the structured reading path, the Synapse book and reading list maps them by level.

FAQ

What is “Following the Trend” by Andreas Clenow about?
It is a practical guide to systematic trend following and managed futures, the strategy of trading futures contracts across many markets to ride large price moves. It covers contracts, diversification, risk management, and how to evaluate performance.

Is “Following the Trend” good for beginners?
Not really. It assumes you are already comfortable with futures, position sizing, and reading performance metrics. Beginners should start with a foundational trading book and come back to this one later.

Who is Andreas Clenow?
CIO and partner of ACIES Asset Management in Zurich, and formerly Reuters’ Global Head of Equity and Commodity Quant Modelling, with over 20 years in the industry. He is a frequent conference speaker and has been quoted across several financial publications.

What is the main lesson of the book?
That diversified, rules-based trend following can earn a place in a portfolio, but only with disciplined risk management and the patience to sit through long drawdowns. Diversification across many markets is the core engine.

What metrics does the book use to judge a strategy?
It uses the Sharpe ratio, drawdown, and the information ratio, to make the point that a headline return means little without knowing how much volatility and pain it took to earn.


Now that you have the key ideas, would you add “Following the Trend” to your reading list? And if you have already read it, what stuck with you most? Let me know in the comments.

Want a system you can actually run? Grab the free 15-Minute Swing Trading Starter Kit. It is the exact routine I use to scan once a day and trade any market in 15 minutes.


About the author. Spencer Li is The 15-Minute Trader and the founder of Synapse Trading. He is a Certified Financial Technician (CFTe) with 15+ years of trading, run from 70+ countries. He holds a B.Acc and B.BM from SMU. Every trade he takes is public, dated, losses left in. He teaches rules-based swing trading in 15 minutes a day, one system for any market.

Education, not financial advice. Synapse Trading is not licensed by MAS to advise on investment products. Trading carries risk of loss; past performance is not indicative of future results.


Related

Best investing and trading books of all time · What is trend following? · Risk management for traders

by Spencer Li
https://synapsetrading.com/wp-content/uploads/2026/10/following-trend-andreas-clenow-card.webp 630 1200 Spencer Li https://synapsetrading.com/wp-content/uploads/2026/10/synapse-logo-horizontal-light.png Spencer Li2023-01-28 18:51:512026-10-22 13:21:26Book Summary: Following the Trend by Andreas Clenow
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