MarketWatch featured an article on the flash crash of May 6, 2010. Here are some highlights:
The ‘flash crash’ turned the stock market on its ear during one violent trading day a year ago, but many investors are still vulnerable to the market’s next bungee jump. Their mistake: stop-loss orders on exchange-traded funds — a move that puts shareholders directly in harm’s way.
Stop-loss orders come in a number of varieties, and can be a smart strategy for protecting profits. The fundamental idea behind them — a set price to exit a security — makes sense, even for a long-term investor who tries not to be swayed by momentary market movements.
That said, the flash crash on May 6, 2010 exposed how the best intentions can create real problems.


