Urban clusters are geographic concentrations of urban places, some of which may include major cities. Unlike agglomerations, whose geographic boundaries are clearly delineated, urban clusters have "variable" boundaries, with each urban settlement being part of its "own" cluster of populated...

Due to spatial separation between points of distribution and consumption, a vital feature of retailing is the provision of delivery services by customers, retailers, or transport intermediaries. Some store retailers, many Internet retailers, and most transport intermediaries use a "multizone...

Early research on migration in LDCs, initially motivated by labor market postulates offered by Harris and Todaro, built upon general equilibrium models of interregional trade. In contrast, recent research on migration (such as Brueckner and Kim in this issue) builds upon a partial equilibrium...