Policy functions summarize the key predictions of any dynamic investment model. They are easy to estimate and account for a large fraction of the variation in corporate investment. Estimated policy functions can also be used estimate deep parameters of a structural model of investment. Variance decomposition of empirical investment equations can be used to identify the key state variables in structural models.
Policy functions summarize the key predictions of any dynamic investment model. They are easy to estimate and account for a large fraction of the variation in corporate investment. Estimated policy functions can also be used estimate deep parameters of a structural model of investment. Variance decomposition of empirical investment equations can be used to identify the key state variables in structural models.