北京市基于社会效用最大化下的土地政策选择

研究目的：构建政府运用土地政策调控市场的社会效用函数，并分析其最优政策选择。研究方法：文献资料法，动态优化分析法，实证研究方法。研究结果：（1）政策调控周期内最优干预力度应逐渐减小；（2）政策调控周期内应持续干预；（3）具体干预时间依赖于效用函数、存量运动方程及价格和干预之间关系等约束条件。研究结论：基于社会效用最大化下的最优土地政策路径可作为评估土地政策调控效果的有力参考。

Land Policy Selection Based on the Principle of Social Utility Maximization in Beijing

The purpose of this paper is to build a social utility function for the government to regulate the land market through its land policies, and to analyze the optimal policy choices. Methods of literature consultation, dynamic optimization analysis and empirical study were employed. The results indicate that: (1)the optimal degree of governmental intervention during policy regulation period should be reduced gradually; (2)within the policy regulation period the intervention should be continuous; (3)the exact time for intervention depends on the restrain condition, such as utility function, the stock motion equations and the relationship between price and intervention, etc. It is concluded that the optimal land policy method based on the principle of social utility maximization should be considered as a useful reference for the evaluation of land policy regulation.