Development of rational expectations models of the business cycle has been the central issue in macroeconomics over the last 15 years. The postulate that expectations are rational imposes considerable discipline on business cycle analysis. In this essay we review the current literature on...

How does the additional uncertainty associated with noisy economic data affect business cycle fluctuations? I use a simple variant of the neoclassical growth model to show that the answer depends crucially on the assumed expectation-formation capabilities of agents. Under efficient signal...