This is not only because South-South migration represents more than 50% of migration stocks flows comparing to South-North migration (Ratha and Shaw, 2007), but also because discriminatory social institutions in non-OECD countries are different and more restrictive than those in place in high-income areas (such as female genital mutilation, early marriage, inheritance laws). First, the empirical analysis adopts a Heckman two-step procedure to deal with the high occurrence of null bilateral flows in migration data and the selection process. Then, 2SLS estimators are used to overcome potential endogeneities, due to reverse causality and unobservables.