This paper creates a new data set on the physical capital at the state level for the United States from 1840 through 2000. We combine these new data with state level human capital and income data to do standard growth accounting exercises and to estimate the contribution of aggregate input...

Simon Kuznets’ (1955) hypothesis that as a country develops, a natural cycle develops where inequality first increases, then decreases, has become known at the Kuznets curve. This pattern has also been applied to the environment, an ‘Environmental Kuznets curve’, showing that as...