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Why has the cyclicality of productivity changed?: what does it mean?
Historically, U.S. labor productivity (output per hour) and total factor productivity (TFP) rose in booms and fell in recessions. Different models of business cycles explain this procyclicality differently. Traditional Keynesian models relied on "factor hoarding," that is, variations in how intensively labor and capital were utilized over the business cycle. Real business cycle (RBC) models instead posit that procyclical technology shocks drive the business cycle. Since the mid-1980s, however, the procyclicality of productivity has waned. TFP has been roughly acyclical with respect to ...