, and participants at the Chicago-Renmin symposium on family and labor economics at the University of Chicago, the symposium of the 80th birthday of Steven Cheung at Shenzhen, U. of Maryland workshop, the AEA meetings, the PAA conference, and the Asian Conference on Applied Micro-Economics/Econometrics at Tokyo for constructive comment and suggestions. We are especially grateful to the late Gary Becker for his detailed comments at the Chicago-Remin symposium in which we presented an earlier version of a related paper. He encouragedųs to consider the issues from the perspective of parents and old age support. This paper would not exist without his encouragement and comments. We also thank the excellent research assistance from Lixin Tang. Huang gratefully acknowledges the financial support of SMU Research Grant 10-C244-SMU-002. The views expressed here do not implicate the World Bank or the countries that it represents. Part of the paper was revised when Jin visits the Federal Trade Commission. Any view expressed here does not represent the view of the Commission, any of its commissioners, or the National Bureau of Economic Research. NBER working papers are circulated for discussion and comment purposes. They have not been peer-reviewed or been subject to the review by the NBER Board of Directors that accompanies official NBER publications.