We show that in a fully integrated economy, in which there is free mobility of goods and factors, each member’s share of total output will equal its shares of total stocks of productive factors (i.e., physical and human capital). We label this result the equal-share relationship. This...

Studies routinely document that the nature of immigrant employment is largely specific: it often concentrates in non-traded goods sectors and many immigrants often have low inter-sectoral mobility. We consider these observed characteristics of immigrant employment for the question of how...