 Demand, of course, can drive prices, which can drive inflation. You see where this is going, right? Marketplace's Mitchell Hartman has our primer. GDP is the broadest measure of goods and services produced in the U.S. economy. It includes pretty much everything. But the Fed needs to get a bead specifically on the level of demand from U.S. businesses and consumers for goods and services, says Kathy Bostjanczyk at Nationwide.