In this paper we consider an overlapping generation model in which people, born in two different countries, decide where to spend their working period of life, and where to retire after it. The two countries differ in technology and quality of life. The "northern" country, N, is more productive,...

We study semiparametric efficiency bounds and efficient estimation of parameters defined through general moment restrictions with missing data. Identification relies on auxiliary data containing information about the distribution of the missing variables conditional on proxy variables that are...