If the U.S. had decided to go back on the gold standard in 2006, where would we be today? That's a question my friend Randy Parker recently asked me. Here's how we both would answer.Many things might have been different had the U.S. decided to promise to exchange dollars for gold at the 2006 price of $600 per ounce of gold. But let's start with some of the things that wouldn't have changed. I contend that we'd be no less worried today about geopolitical events in places like Nigeria,...