The U.S. Dollar Index has fallen sharply in the last few weeks, thanks largely to tariff flip-flopping and overall economic uncertainty. Typically, significant sustained changes in a currency’s value indicate the relative strength of a nation’s economy. Should we be worried? Also: New tariffs triggered a January import rush that will ding GDP, student loan borrowers are temporarily blocked from income-driven repayment plans and Amazon pulls back on its brick-and-mortar grocery biz.