State unemployment rates diverged dramatically in the 1980s. Differing unemployment rates across states are an important public policy concern because of equity concerns and the pure human consequences of higher unemployment. Moreover, at the national level, a greater dispersion in state and regional unemployment rates can increase the natural rate of unemployment and shift the Phillips curve out because of an inefficient allocation of the labor force [3; 38]. One possible cause for the divergence in unemployment rates is national industrial restructuring. U.S. industrial restructuring was suggested by Lilien [26] as a cause for the rise in the national unemployment rate. Moreover, national restructuring can have differential impacts across states because states can have dramatically different mixes of industries from each other. One of the difficulties of national restructuring from a regional perspective is that it is difficult to avoid. On the other hand, if regional differences in unemployment are due to state idiosyncratic causes, state and local public policy can potentially play a more active role. For example, the economic problems that plagued the Northeast and California during the early 1990s have been typically attributed to national downsizing in the defense industries. Conversely, economic problems in these states may have been driven by factors that are located within the state, such as the collapse of their real estate markets.
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Partridge et al. (1995) studied this question.