We propose a theory of endogenous firm-level volatility over the business cycle based on endogenous market exposure. Firms that reach a larger number of markets diversify market-specific demand risk at a cost. The model is driven only by total factor productivity shocks and captures the business...

I carry out a business cycle accounting exercise (Chari, Kehoe and McGrattan, 2007) on theU.S. data measured in wage units (Farmer (2010)) for the entire postwar period. In contrast toa conventional approach, this approach preserves common medium-term business cyclefluctuations in GDP, its...