Testing linearity of spatial interaction functions \`a la Ramsey

Abhimanyu Gupta, Jungyoon Lee and Francesca Rossi

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Abstract: We propose a computationally straightforward test for the linearity of a spatial interaction function. Such functions arise commonly, either as practitioner imposed specifications or due to optimizing behaviour by agents. Our test is nonparametric, but based on the Lagrange Multiplier principle and reminiscent of the Ramsey RESET approach. This entails estimation only under the null hypothesis, which yields an easy to estimate linear spatial autoregressive model. Monte Carlo simulations show excellent size control and power. An empirical study with Finnish data illustrates the test's practical usefulness, shedding light on debates on the presence of tax competition among neighbouring municipalities.

Date: 2024-12
New Economics Papers: this item is included in nep-ecm, nep-mac and nep-ure
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