Back then, program trading, computer robotic dealers caused an avalanche of selling that blew up the markets in a catastrophic vicious circle of robot trading.

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Then some hedge fund may start off their new trading robot designed to do clever things across markets, but whoops, off flies a few tens of millions of dollars in the wrong direction.

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The robot takes the huge order, has a look at the order book, looks at the recent flow of trading, does some math and starts slipping bits of the order out into the market in digestible pieces.

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