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The Impact of Business Environment on China’s Import and Export Trade with the Countries along the Belt and the Road—An Empirical Analysis based on the Extended Gravity Model

In this paper, connections of fixed effects and the extended gravity model with mathematics are built, for the purpose of mathematics-related interdisciplinary application. Based on the relevant data of the import and export trade between China and the countries along the Belt and Road and the global business environment data released by the world bank, the influence of the business environment on the import and export trade between China and other countries along the Belt and the Road is examined through the fixed gravity effect with the expanded gravity model. The results show that: (1) the business environment optimization of the countries along the Belt and Road can significantly promote bilateral import and export trade; (2) China’s business environment optimization can also promote bilateral import and export trade, but not significantly.