The objective of this paper is to examine the formation of specialized
cities with multiple types of households in a decentralized system of
cities. This is done in a two-sector spatial general-equilibrium mode
l of a closed economy consisting of two groups of labor forces: a cont
inuum of unskilled labor used to produce a food product, and a continu
um of skilled labor used in the production of a high-tech product. Cit
ies are formed in this model as a result of investment in public infra
structure. This investment leads to a reduction in commuting cost and
consequently to an increase in the time that households can utilize fo
r work and leisure. The paper characterizes the equilibrium solution f
or a purely specialized system of cities and presents some comparative
static results. Moreover, the paper presents an explanation for the v
ariation in city sizes as a result of differences in households' value
of time. Finally, the paper analyzes the determinants of income dispa
rity between the two different types of cities and its impacts on soci
al welfare.