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Testing linearity of spatial interaction functions \`a la Ramsey

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  • Abhimanyu Gupta
  • Jungyoon Lee
  • Francesca Rossi

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.

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  • Abhimanyu Gupta & Jungyoon Lee & Francesca Rossi, 2024. "Testing linearity of spatial interaction functions \`a la Ramsey," Papers 2412.14778, arXiv.org.
    • Handle: RePEc:arx:papers:2412.14778
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