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Trading & Technical AnalysisBeginner-Intermediate
Flash Boys: A Wall Street Revolt
by Michael Lewis
4.5/5
Michael Lewis's explosive investigation into high-frequency trading and how a group of Wall Street insiders built a fairer stock exchange to fight back. A gripping account of how microseconds became worth billions and what it means for ordinary investors.
Published 2014
288 pages
9 min read
*Disclosure: This article contains affiliate links. If you purchase through these links, we may earn a commission at no additional cost to you. We only recommend books we genuinely believe in.
Quick Overview
In 2014, Michael Lewis published Flash Boys and set off a national debate about whether the U.S. stock market was rigged. The book follows Brad Katsuyama, a Royal Bank of Canada trader who noticed his large orders were being front-run by high-frequency traders before they could be filled, and his subsequent crusade to build a fairer exchange (IEX). Whether or not you agree with Lewis's conclusions, Flash Boys is essential reading for understanding modern market structure and how orders are executed in today's electronic markets.
Book Details
| Attribute | Details |
|---|---|
| Title | Flash Boys: A Wall Street Revolt |
| Author | Michael Lewis |
| Publisher | W.W. Norton |
| Published | 2014 |
| Pages | 288 |
| Reading Level | Beginner to Intermediate |
| Amazon Rating | 4.5/5 stars |
Get Your Copy
Paperback: Buy on Amazon
Kindle: Buy on Amazon
Audiobook: Buy on Amazon
About the Author
Michael Lewis is the author of Liar's Poker, The Big Short, Moneyball, and many other books. Flash Boys was his investigation into high-frequency trading, a topic he knew nothing about before starting and learned by following Brad Katsuyama through his investigation and the construction of IEX.
The Problem Lewis Describes
What Is High-Frequency Trading?
High-frequency trading (HFT) uses sophisticated algorithms and extremely fast technology to execute thousands of trades per second. HFT firms invest enormous sums in:
The speed advantage:
| Communication Method | New York to Chicago |
|---|---|
| Standard fiber optic | 17 milliseconds |
| Optimized fiber optic | 14.5 milliseconds |
| Microwave towers | 8.5 milliseconds |
| Physics limit (speed of light) | ~7 milliseconds |
HFT firms have spent hundreds of millions of dollars to shave fractions of milliseconds off communication times.
Brad Katsuyama's Discovery
Katsuyama ran the U.S. equity trading desk at Royal Bank of Canada. He noticed a frustrating pattern: when he tried to buy 100,000 shares of a stock spread across 12 exchanges, the first exchanges would fill his order but prices at subsequent exchanges would jump before his order arrived. He was buying the first 10,000 shares at $30.00, but the remaining 90,000 would be priced at $30.01 or $30.02.
What was happening:
This is called latency arbitrage or order anticipation. By being faster, HFT firms can effectively see where large orders are going and front-run them.
The scale of the problem:
| Year | HFT Share of U.S. Equity Trading Volume |
|---|---|
| 2005 | ~21% |
| 2009 | ~61% |
| 2012 | ~49% |
| 2019 | ~50% |
The IEX Solution
Katsuyama left RBC and founded IEX (Investors Exchange) in 2013, designed to eliminate the latency arbitrage advantage of HFT firms.
The Speed Bump
IEX's most innovative feature: a 350-microsecond artificial delay ("speed bump") built from 38 miles of fiber optic cable coiled in a box before orders reach the matching engine.
How the speed bump works:
The result:
At IEX, a large institutional order cannot be front-run because by the time an HFT firm detects the order and attempts to adjust, the delay means both the original order and the response arrive at the matching engine simultaneously.
IEX vs. Traditional Exchanges
| Feature | NASDAQ/NYSE | IEX |
|---|---|---|
| Co-location available | Yes ($50,000+/month) | No |
| Speed bump | None | 350 microseconds |
| Flash orders | Available on some venues | No |
| Maker-taker payment | Standard rebates | No rebates |
| Designed for | All market participants | Long-term investors |
The Debate: Is the Market "Rigged"?
Lewis's claim that the stock market is "rigged" generated intense controversy.
The Case That It Is Rigged
The Case That It Is Not Rigged (Or That The Benefits Outweigh Costs)
Bid-ask spread comparison:
| Year | Average Bid-Ask Spread on S&P 500 Stocks |
|---|---|
| 1997 | ~$0.12 (6 cents per side) |
| 2001 | ~$0.05 (post-decimalization) |
| 2005 | ~$0.02 |
| 2014 (Flash Boys published) | ~$0.01 |
| 2024 | ~$0.005-0.01 |
The average retail investor pays dramatically less to trade today than before HFT dominated markets. Most academics argue HFT has net benefited retail investors through tighter spreads, even while creating the latency arbitrage problem Lewis describes.
What Flash Boys Means for Ordinary Investors
The Practical Impact on Long-Term Investors
For passive index fund investors who buy and hold for years, the HFT front-running Lewis describes has minimal impact:
The real victims of latency arbitrage are large institutional traders who make large block trades frequently. Pension funds paying slightly worse prices on every trade do have their long-term returns marginally impacted — but even this is small relative to other factors (management fees, asset allocation decisions).
Payment for Order Flow: The Real Retail Issue
Lewis's book is most directly relevant to retail investors through its treatment of payment for order flow (PFOF):
Is PFOF harmful to retail investors?
| Argument Against PFOF | Argument For PFOF |
|---|---|
| Orders may not get best available price | Retail spreads are still very tight |
| Creates conflict of interest for brokers | Enables zero-commission trading |
| Opacity — customers don't know | Regulatory disclosure required |
| Systematically advantages market makers | Market makers still provide price improvement |
The SEC has studied PFOF extensively. Most evidence suggests retail investors receive prices within 1-2 cents of the best available — a small but real disadvantage. The elimination of commissions (enabled by PFOF revenue) may offset this for small frequent traders.
Actionable Advice for Retail Investors
Given the market structure Lewis describes:
| Action | Benefit |
|---|---|
| Use limit orders instead of market orders | Control the price you pay; avoid paying the spread |
| Trade large quantities in smaller pieces (TWAP/VWAP) | Minimize market impact |
| Use IEX or venues with explicit best execution commitments | Avoid worst front-running venues |
| Avoid trading at the open and close | Most HFT activity and widest spreads |
| For index funds: buy and hold (minimize trading) | Each trade has small frictional cost |
Strengths & Weaknesses
What We Loved
Areas for Improvement
Who Should Read This Book
Highly Recommended For
Probably Not For
Frequently Asked Questions
Q: Should I route my orders to IEX?
A: For large trades, IEX is a reasonable choice. For typical retail investors making small periodic investments, the practical difference between IEX and other venues is negligible — the main benefit is for institutional-size block trades.
Q: Is Robinhood bad because of PFOF?
A: It depends on usage. For small, infrequent trades, zero-commission trading (enabled by PFOF) is beneficial. For large trades or frequent traders, using a broker that prioritizes best execution over PFOF revenue may produce better prices.
Q: Did Flash Boys change anything?
A: IEX gained exchange status in 2016, validating the speed bump model. The SEC has proposed restricting PFOF (though not yet implemented as of 2024). Regulatory attention to market structure increased significantly after the book's publication.
Final Verdict
Rating: 4.5/5
Flash Boys is the most accessible and entertaining account of modern market structure ever written. Its market microstructure education is genuinely valuable, the IEX story is inspiring, and the payment for order flow treatment is directly relevant to retail investors. The "rigged" framing overstates the case, but the book's core insights are sound.
Get Your Copy
Paperback: Buy on Amazon
Kindle: Buy on Amazon
Audiobook: Buy on Amazon
Prices current as of publication date. Free shipping available with Prime.
Topics
#book-review#michael-lewis#high-frequency-trading#HFT#IEX#market-structure#flash-boys#trading
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