We study the dynamics of the cross-section distribution of patents per capita for the 48 continental U.S. states from 1930 to 2000 using a discrete-state Markov chain. We test for and find evidence in favor of the (knowledge) convergence hypothesis as we find that the distribution of patents is...

This paper employs unit root tests that allow for two endogenously determined structural breaks to study whether or not invention activities are converging across US regions/states. Using US patent data from 1929 to 1997, we find technological β-convergence in six of the nine Census regions, in...