Trading Machines

Traders work on the floor during afternoon trading at the New York Stock Exchange.

Scott Patterson, staff reporter at The Wall Street Journal and author of Dark Pools: High-Speed Traders, A.I. Bandits, and the Threat to the Global Financial System and New York Times bestseller The Quants: How a New Breed of Math Whizzes Conquered Wall Street and Nearly Destroyed It, explains how trading "bots" and artificially intelligent systems are running many of the world's markets, and the risks they pose to the financial sector.