Dialect diversity, element agglomeration and city size —— Empirical Test Based on satellite lighting data

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<p>Since the reform and opening up, China's urbanization has developed rapidly Behind the rapid urbanization is the imbalance and insufficiency of urban development From the perspective of social and cultural diversity, this paper explores the impact of the diversity of dialect types on urban scale The diversity of dialects leads to the division of trust, hinders the cross regional flow of factors, affects the agglomeration effect of factors, and then affects the expansion of urban scale Using the diversity index of regional dialect types and 2016 nppviirs urban night light index, this paper empirically studies the impact of dialect diversity on urban scale The measurement results show that: Dialect diversity has a significant negative impact on urban scale On average, the addition of one dialect category will lead to a 4.5% decline in the size of the city measured by the night light index 55%. A series of robustness tests and causal identification show that the estimation result in this paper is the causal relationship of robustnessfurther empirical research shows that dialect diversity mainly affects the expansion of urban scale by hindering the flow and agglomeration of labor, capital and technological factorsthe Enlightenment of this study: To build a diversified and inclusive modern city, we need to weigh the costs and benefits of cultural diversity and unity, break cultural barriers, eliminate cultural prejudices, improve social trust, and give full play to the complementary effects brought by multiculturalism</p>