With stock markets closed today for Good Friday, the firstquarter of 2018 is in the books, with the Dow Jones Industrial Average and S&P 500 in the red for the quarter, and Facebook and Google down.

Be smart: Wall Streeters tell me that Trump’s impulsive crashing around on issues has started to affect market psychology. The economy’s fundamentals, and corporate performance, are strong. But he is the x factor.

A tweet by Neil Irwin of the N.Y. Times Upshot captures the Street zeitgeist: “It seems like markets are settling into a new groove in which modest news creates outsized swings in prices, whether for tech stocks or companies vulnerable to a trade war. The baseline assumption that ‘it will all be OK’ isn’t there anymore.”