Abstract
The data of the sixth population census showed that Chongqing city has already entered the old society. The population age structure showed that the proportion of children continued to decline, the proportion of elderly and the proportion of working-age population kept rising. This article introduces the Cobb-Douglas production function model and internalizes the total dependency ratio, children dependency ratio and old dependency ratio into the labor input factors to expand the model furtherly and analyze the influence of the change of the population age structure on economic growth. The analysis finds that the contribution of the effective supply of labor force to economic growth is very large, and the impact of dependency ratio on economic growth through labor supply is also significant and suggestions can be put forward based on this.
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