Has the financial sector learned?

Fed expressed concerns that "flash crash" could become more common

Competing algorithms could be the culprit. And a new study says they're on the rise.

On the two-year anniversary of the 'flash crash,' market watchers wonder if automated trading could lead to another meltdown.

It’s fast and furious, and highly controversial. High-frequency trading is the computer–based buying and selling of shares within fractions of a milli-second. A new study just out in Britain suggests this kind of trading is mostly beneficial.

The markets tumbled Friday, but the declines were nothing compared to the Black Monday crash of Oct. 19, 1987. The Dow Jones shed 22 percent — the equivalent of a 3,000-point drop today.

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