基于剩余收入的消费者均衡模型修正

Correction of consumer equilibrium model based on residual income

传统的消费者均衡模型没有对收入进行细化,其效用函数只体现商品的效用,收入则没有直接进入效用函数,而是体现在预算约束条件里,造成"均衡等式矛盾"的漏洞。为推出更加合理的消费者均衡等式,将传统模型中的收入细化为总收入、剩余收入和实际支出3部分,将剩余收入引入效用函数,运用条件极值法建立修正的消费者均衡模型。研究结论认为,传统的消费者均衡模型是修正的消费者均衡模型的一个特例,运用修正的消费者均衡模型可以更好地理解货币的边际效用,也可以为宏观经济现象提供微观理论依据。

The traditional consumer equilibrium model doesn＇ t specify the income of consumer, whose utility function only reflects the utility of commodity. Meanwhile, the income is not involved in the utility function directly, but is expressed in budget constraint condition, which resulted in the loophole of ＂equilibrium equation of contradiction＂. In order to deduce more reasonable equilibrium equation of consumer, the income in traditional model is specified into three parts of total income, residual income and actual expenditure, the residual income is introduced into utility function, and conditional extremum method is applied to establish correctional consumer equilibrium model. Conclusion is drawn that traditional consumer equilibrium model is a special case of correctional consumer equilibrium model, and that marginal utility of currency can be understood better, and microeconomic theory basis can be provided for macroeconomic phenomenon through applying correctional consumer equilibrium model.