A Nonparametric Analysis of Income Convergence Across the US States, by Paul A. Johnson (Dec. 1999)
In this paper I apply the nonparametric methods proposed by Quah to data on US state relative income levels. In contrast to Quah’s results using cross-country data I find no evidence of polarization in the cross-state income distribution. The long-run density implied by the estimates is strongly unimodal. This finding is consistent with the results of previous analyses of convergence in state income levels using other methods.
Published: Economics Letters, 2000, 69:219-23.