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The Lessons of Black Monday

When interpreting sharp drops in stock prices and their impact, many will think back to 2008 and the market turbulence surrounding Lehman Brothers’ bankruptcy filing. But a better historical precedent for current conditions is the huge one-day drop on October 19, 1987.

BERKELEY – US President Donald Trump has regularly pointed to the stock market as a source of validation of his administration’s economic program. But, while the Dow Jones Industrial Average (DJIA) has risen by roughly 30% since Trump’s inauguration, the extent to which the market’s rise was due to the president’s policies is uncertain. What is certain, as we have recently been reminded, is that what goes up can come down.

When interpreting sharp drops in stock prices and their impact, many will think back to 2008 and the market turbulence surrounding Lehman Brothers’ bankruptcy filing. But a better historical precedent for current conditions is Black Monday: October 19, 1987.

Black Monday was a big deal: the 22.6% price collapse is still the largest one-day percentage drop in the DJIA on record. The equivalent today would be – wait for it – 6,000 points on the Dow.

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