based on cost-benefit analysis in an urban perspective 中国城市适度人口决定与测度研究：基于城市化发展收益成本效应视角：based on cost-benefit analysis in an urban perspective based on full costs-benefits and households' preference perspective based on the financial and traffic perspective based on the financial structure perspective based on regional disparity perspective based on internal control perspective based on an external control perspective based on self-organization theory perspective based on China's theoretic analysis and practical inspection