One of the lessons from the flash crash was that it's better to stop trading and reopen a market in a fair and orderly manner than to have messy trading, said James Angel, a finance professor at Georgetown University who specializes in the structure and regulation of financial markets.
"I think people are so used to the fact that every once in a while the power goes out and a computer crashes," Angel said. "As long as the trading is fair and orderly, I don't think that's going to deter people from investing."
Trading glitches can also change fortunes. A technical bug spelled the end for Knight Capital as a stand-alone company. It marred the company's long-standing reputation as a stellar risk manager after sending stocks of dozens of companies swinging wildly on Aug. 1 of last year.
It also left Knight, which takes orders from big brokers like TD Ameritrade and E-Trade, on the hook for many of the stocks that its computers accidentally ordered. Knight teetered near bankruptcy and this summer was taken over by the high-speed trading firm Getco.
Associated Press Business Writers Christina Rexrode, Steve Rothwell, Marcy Gordon, Chris Rugaber and Jim Kuhnhenn contributed to this report.