Global markets' 90-day tariff pause rollercoaster nears an uncertain end

The deadline U.S. President Donald Trump set for major trading partners to strike deals with Washington or face hefty tariffs expires next week, bringing to a close 90 days of volatility but leaving global investors in the dark over what will happen next. Mr. Trump's propensity to issue a threat, or impose a new tariff, only to reverse course shortly afterwards has led to turmoil over the past three months. Investors, however, have now become somewhat inured to this sort of policymaking on the fly. And, as a result, there is little evidence at this point that many are preparing…