Citi: Maybe Flash Crashes Aren’t So Bad, After All

Big moves in markets don't necessarily disrupt the economy

Here's a pic of one famous flash crash.

Photographer: Jin Lee/Bloomberg
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Flash crashes—those days when stocks, bonds, and currencies all make big, sudden moves in tandem—may roil financial markets, but they don’t seem to make a big difference to the real economy, according to Citigroup.

Analyst Steven Englander built a working definition of what qualifies as a flash crash, then went about analyzing what the impact of all that frenzied trading was. His conclusion: not much.