""Of All the Economic Bubbles that have been pricked," the editors of the Economist recently observed, "few have burst more spectacularly than the reputation of economics itself." Indeed, the financial crisis that crested in 2008 destroyed the credibility of the economic thinking that had guided...

This paper presents a theory of the monetary transmission mechanism in an old-Keynesian model with multiple equilibrium unemployment rates. The model has two equations in common with the new-Keynesian model; the optimizing IS curve and the policy rule. It differs from the new-Keynesian model by...