  A new economic geography model is proposed in which the migration of mobile
workers is proximate and perturbed by non-economic factors. The model consists
of a tractable core-periphery model assuming a quasi-linear log utility
function of consumers and an advection-diffusion equation governing the time
evolution of a population distribution. The stability of a spatially
homogeneous stationary solution and the large time behavior of solutions to the
model on a one-dimensional periodic space are investigated. When the spatially
homogeneous stationary solution is unstable, solutions starting around it are
found to eventually form spatial patterns with several urban areas in which
mobile workers agglomerate.
