SHOULD WE BE worried about the U.S. dollar falling to all-time lows vs. foreign currencies? Does it matter to investors? Yes it matters, and yes you should be worried — but not for the reasons that you may think. First, let's get all the wrong reasons out of the way. One reason you hear all the time is that the U.S. is growing slower than the rest of the world, so global investors want to move out of dollars and into the currencies of countries that are growing faster. Fine — China and some other emerging markets are growing faster....