"It was, at least in theory, simple enough in the old days," wrote a wistful W. Randolph Burgess, head of the New York Federal Reserve, in 1938. "In the present strange new world, where the old gold portents have lost their former meaning, where is the radio beam which the central banker may follow? What is the equivalent of gold?" The men of his era and of the late nineteenth century understood the meaning of such a question and, more importantly, why it is one that must be asked. But theirs was a different world, indeed — one without "QE," ZIRP," or "Unknown Knowns" as fiscal policy. And there were no helicopters, either.