In Chicago last week, for an event in honor of the 100 birthday of Milton Friedman, I briefly stopped by the Occupy Chicago protest to get a breath of fresh air. Since I'm interested in monetary policy, I was interested in why they'd chosen the Chicago branch of the Federal Reserve (there are 12 branches) as the venue for their demonstration. There turned out to be no particularly clear ideological reasoning behind the choice and, in fact, some sentiment that they really ought to decamp in favor of the Chicago Mercantile Exchange. Nobody had especially strong views on monetary policy. It made me wish Chicago Fed President Charles Evans would come down and speak to the protesters. He, though by no means a drum-circle type, is just about the best central banker we have at this point and recently gave a speech that, in my view, is the best explanation of why we need a 99 Percent Movement today. The speech, to be clear, isn't the stuff of protest rallies. It includes math. Specifically,...