Recent research by David Lilien shows that a significant fraction of aggregate unemployment can be explained by the dispersion of employment growth across industries. This paper presents two new results in this area. First, it is shown that a significant fraction of the variation in Lilien's dispersion index is due to the differential impact of oil shocks across industries. Second, and more important, it is shown that, once the dispersion in employment growth due to oil shocks is accounted for, the residual dispersion has no explanatory power for unemployment.
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Prakash Loungani (1986) studied this question.