Flash Boys: 8 key ideas
The core ideas of Flash Boys, each in under a minute, written in our own words. Want the full depth? Get the book.
- IDEA 1 OF 8
Speed created hidden advantages
Lewis describes how high-frequency traders used extremely fast computers and connections to trade shares in tiny fractions of a second.
He argues that this speed let them profit from other investors' orders, an advantage most people did not know existed.
- IDEA 2 OF 8
A trader noticed something wrong
Lewis describes Brad Katsuyama, a trader at a Canadian bank, who noticed that prices moved before his orders were completed.
He set out to understand why. In Lewis's account, he noticed that his orders seemed to be affected by someone faster, and he wanted to know who and how.
- IDEA 3 OF 8
Milliseconds mattered
Lewis explains that some traders paid for faster connections to exchanges.
Being a few milliseconds faster brought profits. In Lewis's account, even tiny gaps in time could be turned into money if a trader reacted a little before others.
- IDEA 4 OF 8
A cable was built for speed
Lewis describes Spread Networks, which built a straight fibre-optic cable between Chicago and New York to save time.
Traders paid heavily to use it. In Lewis's account, speed was valuable enough that firms were willing to pay large amounts for a slightly shorter path.
- IDEA 5 OF 8
Fast traders jumped ahead
Lewis describes latency arbitrage, where fast traders saw orders and traded ahead of them.
Ordinary investors paid more. In Lewis's account, this meant that ordinary investors could end up paying a slightly worse price without knowing why.
- IDEA 6 OF 8
Hidden markets added complexity
Lewis describes dark pools, private trading venues where activity was less visible.
They created concerns about fairness. In Lewis's account, since less was visible in these venues, many people worried that some traders had an unfair edge.
- IDEA 7 OF 8
IEX tried to fix it
Katsuyama and colleagues founded IEX, an exchange designed to reduce unfair speed advantages.
It introduced a speed bump. In Lewis's account, the aim was to make trading fairer for ordinary investors by slowing down some of the fastest tricks.
- IDEA 8 OF 8
Markets need fairness
Lewis argues that markets should be fair and transparent.
His book sparked debate about high-frequency trading. In Lewis's account, he thought people should know how their trades are handled, and the book led many to argue about it.
Get one idea like this every daySwipe through ideas, go deeper on any of them, and save the ones that matter. Free.
Read Flash Boys in the app