Propositions about long-run neutrality are at the heart of macroeconomics. In the 1970s, Lucas and Sargent criticized traditional neutrality tests, suggesting that long-run propositions could not be tested without a detailed structural model. Yet, when nominal variables are integrated, long-run...

Recent developments in macroeconomic theory emphasize that transient economic fluctuations can arise as responses to changes in long run factors -- in particular, technological improvements -- rather than short run factors. This contrasts with the view that short run fluctuations and shifts in...

Recent developments in macroeconomic theory emphasize that transient economic fluctuations can arise as responses to changes in long run factors -- in particular, technological improvements -- rather than short run factors. This contrasts with the view that short run fluctuations and shifts in...

We study two decompositions of inflation, , motivated by a New Keynesian Pricing Equation. The first uses four components: lagged , expected future , real unit labor cost ( ), and a residual. The second uses two components: fundamental inflation (discounted expected future ) and a residual. We...

Discretionary policymaking can foster strategic complementarities between private sector decisions, thus leading to multiple equilibria. This article studies a simple example, originating with Kydland and Prescott, of a government which must decide whether to build a dam to prevent adverse...

The average length of business cycle contractions in the United States fell from 20.5 months in the prewar period to 10.7 months in the postwar period. Similarly, the average length of business cycle expansions rose from 25.3 months in the prewar period to 49.9 months in the postwar period. This...