多种类型公共支出与经济增长

Multi-Types of Public Expenditure and Economic Growth:A Framework

本文构建了一个包含多种类型公共支出的内生经济增长模型,其中包括具有不同产出弹性和消费弹性的纯生产性支出、纯消费性支出与生产-消费混合型支出。在这一框架里探讨了多种类型公共支出促进经济增长和社会福利的机制,考察了社会最优路径的存在性和唯一性,给出了一组各种公共支出的最优条件及相互间的最优比例关系,并研究了不同筹资模式下分散均衡路径的福利性质。本文还通过一个特例考察了三类典型公共支出的最优解析路径,并进行了比较静态分析。最后对某些公共服务所具有的拥挤性和排他性特征进行了初步的讨论。

The paper develops an endogenous growth model which involves muhi-types of public expenditure, such as pure productive, pure consumptive and productive-consumptive mixed expenditures with various production elasticity or consumption elasticity respectively. In such a framework, we discuss the mechanism of multi-types of public expenditures enhancing growth and welfare, and also the existence and uniqueness of social optimal path, and give a series of optimality conditions for various types of public expenditure. The welfare properties of decentralized equilibrium are analyzed in various financing patterns. The analytic optimal solutions of three typical types of public expenditure and relevant comparative static analysis are also studied through a special example. And finally the specifications of some public services with congestion and excludability are discussed.