John Authers, Columnist

Trump Has Added an Element of Randomness to Markets

Investors have finally started to take the president’s Twitter feed seriously. Also, another recession indicator flashes red. 

President Donald Trump is roiling markets.

Photographer: Bertrand Guay/AFP/Getty Images

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Like many others who earn their living prognosticating markets, I try my hardest to keep from handicapping political developments and their influence on markets. But it’s no longer possible to avoid politics when commenting on markets. Blame Donald Trump’s Twitter feed.