Even when the economy and the securities markets are sluggish, the Fed's financing of big federal deficits can be inflationary. We learned that in the late 1970s, when the Fed's deficit financing sent the CPI up to an annual rate of almost 15%. That confounded the Keynesian theorists who believed then, as now, that federal spending "stimulus" would restore economic health.
Inflation is the product of the demand for money as well as of the supply. And if the Fed finances federal deficits in a moribund economy, it can create more money than the economy can use. The result is "stagflation," a term coined to describe the 1970s experience. As the global economy slows and Congress relies more on the Fed to finance a huge deficit, there is a very real danger of a return of stagflation. I wonder why no one in Congress or the Obama administration has thought of that as a potential consequence of their stimulus package.