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Pattern formation by advection-diffusion in new economic geography

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  • Kensuke Ohtake

Abstract

This paper studies spatial patterns formed by a proximate population migration driven by real wage gradients and other idiosyncratic factors. The model consists of a tractable core-periphery model incorporating a quasi-linear log utility function and an advection-diffusion equation expressing population migration. It is found that diffusion stabilizes a homogeneous stationary solution when transport costs are sufficiently low, and it also inhibits the monotonic facilitation of agglomeration caused by lower transport costs in some cases. When the homogeneous stationary solution is unstable, numerical simulations show spatial patterns having multiple urban areas. Insights into the relation between agglomeration and control parameters (transport costs and preference for variety of consumers) gained from the large-time behavior of solutions confirm the validity of the analysis of linearized equations.

Suggested Citation

  • Kensuke Ohtake, 2024. "Pattern formation by advection-diffusion in new economic geography," Papers 2407.05804, arXiv.org, revised Mar 2025.
    • Handle: RePEc:arx:papers:2407.05804
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