Bridging the gap between growth theory and the new economic geography: The spatial Ramsey model
We study a Ramsey problem in in¯nite and continuous time and space. The problem is discounted both temporally and spatially. Capital flows to loca- tions with higher marginal return. We show that the problem amounts to optimal control of parabolic partial differential equations (PDEs). We rely on the existing related mathematical literature to derive the Pontryagin con- ditions. Using explicit representations of the solutions to the PDEs, we first show that the resulting dynamic system gives rise to an ill-posed problem in the sense of Hadamard (1923). We then turn to the spatial Ramsey problem with linear utility. The obtained properties are significantly dfferent from those of the non-spatial linear Ramsey model due to the spatial dynamics induced by capital mobility.
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|Note:||In : Macroeconomic Dynamics, 13(1) 20-45, 2009|
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