Value-added taxes (VATs) are used in a large number of developed countries and have been under consideration at the national level in the United States in recent years. This paper provides an introduction to the tax for those unfamiliar with it. The author begins by describing how VATs work and...

This paper shows a convenient way to test whether instrumental variables are correlated with individual effects in a panel data set. It shows that the correlated fixed effects specification tests developed by Hausman and Taylor (1981) extend in an analogous way to panel data sets with endogenous...

Federal tax policy provides a broad array of incentives for energy investment. I review those policies and construct estimates of marginal effective tax rates for different energy capital investments as of 2007. Effective tax rates vary widely across investment classes. I then consider...