Yahoo Finance(@YahooFinance):Black Monday turns 39 today, and a modern echo of its selling spiral is near record size. In 1987, portfolio insurance had investors selling as prices fell, but too many did it at once. Today, leveraged ETFs generally have to do something similar to hit their targets, selling after losses and buying after gains. Read more:

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参加 January 2009

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Yahoo Finance@YahooFinance

2026.10.19 22:30

Black Monday turns 39 today, and a modern echo of its selling spiral is near record size. In 1987, portfolio insurance had investors selling as prices fell, but too many did it at once. Today, leveraged ETFs generally have to do something similar to hit their targets, selling after losses and buying after gains. Read more: