Market Extra: Here’s why the Dow took the Trump tariffs so hard

Add trade tensions and the threat they pose to economic growth to the list of worries already dogging stock-market investors in 2018.

President Donald Trump’s announcement Thursday that he was set to impose tariffs on aluminum and steel imports sent stocks tumbling, with the Dow DJIA, -1.68%ending the day down 420.22 points, or 1.7%, while the S&P 500 SPX, -1.33% plunged 1.3%. Implied volatility, as measured by the Cboe Volatility Index VIX, +8.32% or VIX, jumped Thursday afternoon, ending the day around 13% higher at 22.47, after pushing above 25.

See: Trump’s tariffs mean higher prices—and maybe even beer in plastic bags

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