Abstract:
The main objective of this study is to investigate quantitatively the economic effects of the introduction of National Pension Fund (NPF) scheme on the members of Social Security Fund (SSF)'s old ages benefits by using the Generational Accounting Approach. Internal rate of return and life time benefits-cost ratio of members are estimated by age cohorts and income classes. Another objective of this study is to analyzes the sustainability of SSF by considering the so-called closed group unfunded obligation as its index. The wage profiles of SSF's members are hypothetically simulated basing on present wage functions which are extimated by using private employees' wages data in 1999-2005 Labor Force Survey. Our results demonstrate that, social security fund (SSF) has intergenerational inequality feature. Furthermore. SSF has redistributive effect from members who have income more than 15000 baht per month to members who have income less than or equal 15,000 baht per month. The higher discount rate is, the more obvious intergenerational inequity featur. The similar results are attained after the introduction of NPF, which has been designed as partially-PAYG pension system. However, retired members of NPF will attain pension in total from NPF and SSF approximetely 30% of income level before retirement that is constant mean-test income or base income. Moreover, we found that, to increase contribution or retirement age will postpone the unfunded obligation more than 48 years.