“…A literature in closed-economy macroeconomics going back to Greenwood, Hercowitz, and Human (1988) studies the implications of variable factor utilization for domestic business cycles (see, among many others, Bils and Cho, 1994;Cooley, Hansen, and Prescott, 1995;Gilchrist and Williams, 2000;Fair, 2018;Chodorow-Reich, Karabarbounis, and Kekre, 2019). Closely related to the focus of BFK, Shapiro (1993) nds that variations in capital's workweek explain much of the cyclicality of TFP.…”