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Economic Theory and the Spatial Mismatch Hypothesis

Department of Economics, Boston College, Chestnut Hill, MA 02167, USA, richard.arnott{at}bc.edu

The spatial mismatch hypothesis is that "Serious limitations on black residential choice, combined with the steady dispersal of jobs from central cities, are responsible for the low rates of employment and low earnings of Afro-American workers" (Kain, 1994, p. 371). Despite a wealth of related empirical studies, there has been little work formalising the hypothesis. This paper presents a trade-theoretic model, with three regions (downtown, suburbia and the rest of the world), four goods (a tradable home good, untraded services, a tradable foreign good and land), and two factors (skilled and unskilled workers). Blacks are constrained to live downtown but by incurring commuting costs can work in suburbia. Several exogenous changes are considered (for example a fall in transport costs between suburbia and the rest of the world) which may lead simultaneously to a fall in the downtown unskilled wage and to job suburbanisation, and which therefore provide a theoretical basis for the hypothesis.

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