In this review we survey advances in analysis of the hub location problem and its variants. In the course of the review opportunities for enhanced analysis become apparent. We emphasize the most pressing areas for further work. We found that first, research needs to be devoted to developing more reliable heuristics for the multiple assignment model and its extensions and second, that additional research is needed to understand the conditions under which the model will tend to have integer solutions. Research in this area will contribute to the solution of a longstanding puzzle in economics about the allocation of indivisible resources.

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Using boundary-matched 1980 and 1990 census tract data for the central county of the Columbus, Ohio, metropolitan area, the authors explore the effect that public housing has on changes in neighborhood poverty rates to evaluate the impact of governmental and institutional actions on recent increases in poverty concentration within urban areas. Three important findings emerge: Public housing concentrated poverty in Columbus during the 1980s, the effect of public housing on poverty concentration was greater among blacks than whites, and public housing concentrates poverty because host neighborhoods house the at-risk portion of the population and because public housing affects the surrounding housing market.

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