Regulators Slow to Act on Speed Traders

It’s been almost two years since the “Flash Crash” of May 2010, when the Dow Jones plummeted 600 points in five minutes, only to gain most of it back over the next 20. In their after-action report a few months later, the SEC and CFTC faulted high-frequency traders for exaggerating the sell-off with their rapid-fire trading techniques. . .