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American Economic Review: Vol. 96 No. 3 (June 2006)

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Medium-Term Business Cycles

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Comin, Diego, and Mark Gertler. 2006. "Medium-Term Business Cycles." American Economic Review, 96(3): 523-551.

DOI: 10.1257/aer.96.3.523

Abstract

Over the postwar period, many industrialized countries have experienced significant medium-frequency oscillations between periods of robust growth versus relative stagnation. Conventional business cycle filters, however, tend to sweep these oscillations into the trend. In this paper we explore whether they may, instead, reflect a persistent response of economic activity to the high-frequency fluctuations normally associated with the cycle. We define as the medium-term cycle the sum of the highand medium-frequency variation in the data, and then show that these kinds of fluctuations are substantially more volatile and persistent than are the conventional measures. These fluctuations, further, feature significant procyclical movements in both embodied and disembodied technological change, and research and development (R&D), as well as the efficiency and intensity of resource utilization. We then develop a model of medium-term business cycles. A virtue of the framework is that, in addition to offering a unified approach to explaining the high- and mediumfrequency variation in the data, it fully endogenizes the movements in productivity that appear central to the persistence of these fluctuations. For comparison, we also explore how well an exogenous productivity model can explain the facts. (JEL E3, O3)

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Authors

Comin, Diego
Gertler, Mark


American Economic Review


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