"There are lots of different measures of inflation. I would argue that commodities, per se, steel, copper, aluminum, hides, whatever, used to be a very good indicator of overall inflation in the economy when we were heavily industrialized. Now they represent a very small part of the economy and services are far more relevant to the purchasing power of the currency than at any time, so that broader measures of price, in my judgment, are more relevant to determining what the true rate of inflation is." greenspan 1997