In retail markets, the nature of spatial cost differs markedly from specifications given in traditional spatial models. At the retail level, transportation is provided by the household and incurred on a per shopping trip basis. In traditional models, the source of transportation is ignored and the cost specified to accrue on a per unit basis. Additionally, in a retail market, spatial cost may be obviated altogether by virtue of a commute. When these characteristics are taken into account, the spatial retail model is inherently more competitive in structure and performance than the traditional spatial model. © 1991 Elsevier Science Publishers B.V. (North-Holland).