How many economists does it take to change a light bulb? None. When the one they used in graduate school goes out, they sit in the dark.
Robert Samuelson writes here about how mainstream economists have done such a poor job of forecasting the economic crisis and that they have been consistently overestimating economic growth. Keynesian economics and monetarism are both under a cloud, but there does not appear to him there is any easy answer. How about a new light bulb, a good idea, Austrian economics?