“…In the formula, TPi and TRi represent the total population size and rank of the i-th city, TP1 represents the total population size of the first city (city 1), and q1 represents the elastic coefficient (constant). Empirical studies in many countries have proven that the urban population size is subject to Zipf's law [70,71], including America [72][73][74], China [75][76][77], Canada [78], Germany [79], Denmark [80], Croatia [81], Netherlands [82], Polish [83], Malaysia [84], India [85], South Africa [86], and Turkey [87].…”