We study the dynamics of an industry subject to aggregate demand shocks where the productivity of a firm's technology evolves stochastically over time. Each period, each firm, given the aggregate demand shock, the productivity of its technology, and the distribution of technology productivities...

We develop a theoretical model of the dynamics of an industry over the business cycle. We characterize the intertemporal evolution of the distribution of firms, where firms are distinguished by their capital in place and the productivity of their technology. We contrast investment and exit...