Florence Jaumotte, Ksenia Koloskova, Sweta C. Saxena The phenomenon of workers moving from a poor to a rich economy, whether internally or across countries, is a very prevalent one. It also is a salient issue, with such migration flows very high on the political agenda in many rich countries. When a worker moves to an economy richer than the home economy, what are the gains? It has been argued that the migrant gains from such a move are very large. For example, Kennan (2013) estimates a gain in net income of 125% in a model of migrants from poor countries to rich ones. This view is reinforced by findings in the literature, with large cross-country differences in GDP per capita and wages.