Universal Two-child Policy And Contribution Rate Of Pension Insurance For Enterprise Employees

After strictly implementing the "one-child" policy for more than 30 years,China adopted a new "two-child" policy.The adjustment of the birth policy will have a significant impact on China's future population growth rate,which will profoundly affect pension insurance.This paper combines the reality of the basic pension insurance for enterprise employees in China,and uses the analysis framework of the two time OLG model to explore the impact of the change in population growth rate after the implementation of the“two-child”policy on the social pooling contribution rate.Firstly,on the basis of the classic Logistic population prediction model,expanded the Logistic model to describe the new second child population after the implementation of the“two child”policy,and predict the population in the context of“two-child”policy from 2016 to 2020.Then predict the trend of the total population over the next 30 years.Secondly,combined with the OLG model and the social welfare function,the explicit expression of the optimal social contribution rate on the population growth rate is derived.The optimal social pooling contribution rate after the adjustment of the birth policy is given by numerical simulation.The study found that the optimal social pooling contribution rate after the implementation of the“two-child”policy is 17.54%.The current social pooling contribution rate has a space for decline.Lowering the social pooling contribution rate can improve the effectiveness of individuals and promote economic growth.