Spatial variations in US unemployment

Inter-state unemployment rate differentials are large, tend to persist, and have not converged in recent times. The interstate differential in the natural rate of unemployment seems partially explained by several factors related to labor costs, including wage rates and such institutional factors as unionization, welfare, and probably tax policy. Differential welfare incidence may explain the black-white unemployment differential. Variations in intertemporal fluctuations in unemployment across states seem related to institutionalized wage rigidity caused by such factors as unions and welfare. For still unexplained reasons, unemployment tends to be higher in the West, deep South, and the industrial Midwest.