Lessons from the Hash Crash

After the collapse of the S&P 500 index last April, one question was on everyone's lips: Who from Twitter or the automated trading community was to blame for the $138 billion plunge in the market? When a fake tweet from the Associated Press-reporting that two explosions had occurred within the White House and that President Obama had been injured-was picked up by computer-based trading systems, stocks tumbled within minutes.

The S&P 500 experienced a significant loss in market capitalization,

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