As Paul Samuelson once put it: Adam Smith is dead and Keynes is dead; well— and Mises is dead, too. But Keynesianism is alive and well and back with a vengeance. Built on solid neoclassical foundations, this “new” Keynesianism, which features the effects of nominal rigidities in the presence of economic shocks and the existence of involuntary unemployment, represents the theoretical core of mod...