A Barro-type economic growth model is estimated for the 50 states in the U.S. using data for three decades beginning in 1960. Frontier estimation techniques are used to test for the presence of state-specific shocks to economic growth that are independent of the usual, normally-distributed...

We develop a dynamic, theoretical model that explains how the diffusion of clean technologies has lead to a decrease in the EPA's criteria pollutants over the past four decades while the U.S. economy has continued to expand over this time. These clean technologies are used in both energy...