independence of a class of economic choice models. We state an economic property known as reducibility and prove that reducibility ensures linear independence and hence identification. Reducibility makes verifying the identification of nonlinear models easy. We use our mixtures framework to...

contributions to aggregate productivity growth over this period. While reallocation is important for aggregate productivity growth, it contributes little to fluctuations in aggregate productivity growth at business cycle frequencies. Almost all of the volatility in aggregate productivity growth...