US stocks slid Monday as investors braced for President Donald Trump’s proposed tariffs on Canada and Mexico to go into effect by the midnight deadline. The Dow tumbled 650 points, or 1.48%, to close at 43,

Often, drops in Treasury yields can give a boost to stock prices because they make loans cheaper to get and give a boost to the economy. But the reason for this recent drop in yields, softer economic growth expectations, may mean that’s not the case this time, according to Morgan Stanley strategists led by Michael Wilson.