The US dollar is on track for its worst year in modern history and may not be done falling yet. The greenback is down more than 7% this year and Morgan Stanley predicts it could fall another 10%. A weaker dollar could make US exports more competitive, boosting Trump’s plan to rebalance US trade, but makes imports more expensive, adding to the sting of tariffs.The question ahead is whether the dollar doesn’t just lose its value, but its role at the center of the global financial system. So far, ...