关键词: 劳动力供给, 人口规模, 劳动年龄人口比重, 劳动参与率, 经济增长

Abstract:  Labor supply is an important source of economic growth．In this paper，we use the factorization method to quantify the contribution of labour supply in China's economic growth by decomposing the labor supply factor into the population size，the proportion of working-age population，and the labor participation rate factors．We put them all into the classic Cobb-Douglas production function．Based on the theoretical model derivation，this paper analyzes the time series data from 1978 to 2015．The results show that labor supply has a significant contribution to China's economic growth in a long term．Its impact and contribution are less significant than the fixed assets，but much greater than the human cap- ital．The main contribution of China's economic growth comes from the input of material capital rather than the labor supply．All of the three variables representing the scale of labor supply have significant effects on economic growth in the same direction，but the magnitude of the effects varies．The order of the contribution and elasticity of the three factors to the total economic output are the total population，the proportion of the working-age population，and the labor participation rate．Finally， in recent years the decrease of the proportion of working-age population does suppress China's economic growth，but this negative impact is to some extent offset by the increase in the size of the total population．

Keywords:  Labor Supply, Population Size, Proportion of the Work-age Population, Labor Participation Rate, Economic Growth