基于凯恩斯消费理论,我们构建面板数据的非参数消费函数模型,利用我国30个省市2003年第1季度至2010年第4季度的面板数据,估计并分析我国城镇居民的非线性消费函数,得出消费与收入的动态关系。这种非参数模型的设定符合凯恩斯的建模思想,使得我国城镇居民的边际消费倾向兼具地区差异性和时变性。实证结果表明:我国城镇居民的边际消费倾向呈现很强的递减规律,无论从全国平均水平,还是从各个省份来看,这种规律都是客观存在的,而且这种规律在横向(省份比较)和纵向(时间趋势)两个方向上都是显著的。由此得出,更加公平的收入分配能缩小收入差距、扩大总需求。
Based on the consumption theory of Keynes, this paper estimates nonparametric consumption function models using panel data from 30 provinces in China from the first Quarter of 2003 to the fourth Quarter of 2010. We estimate and analyze Chinese urban residents' nonlinear consumption function and obtain the dynamic relationship between consumption and income. These nonparametric models are consistent with Keynes' theory and allow Chinese urban residents' MPC to vary with region and time. The empirical results show that the typical Chinese resident's marginal propensity to consumption is strongly degressive. Either at the national level or at the provincial level, the law of diminishing marginal propensity to consumption holds, and the law is applicable both in the spacial dimension ( across provinces) and the hmgitudimll dimension (over time). Hence, a more equitable income distribution will narrow income gap and inerease, total demand.