Macroeconomics: Back to Square One

I agree with the harsh judgment that Lucas and Sargent (1979) made about the macromodels of their day– that they relied on identifying assumptions that were not credible. The situation now is worse. Models make assumptions that are no more credible and far more opaque.

I also agree with the harsh judgment that Lucas and Sargent made about the predictions of those Keynesian models, the prediction that an increase in the inflation rate would cause a reduction in the unemployment rate.

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