It more or less presupposes a direct trade-off between unemployment, inflation, and the federal funds rate. And the federal funds rate is a short term rate. Moreover, it isn't even a rate the Fed controls directly. The Fed controls the discount rate. I fear this isn't simply an oversimplification of the system. It has it all wrong, but it probably is in line with mainstream thinking on the subject insofar as we can even talk about a mainstream anymore.