Peral says that in the last 10 years globally remittances have doubled, meaning that more and more money is being sent by migrants to their families back home.

NPR: Mexico Hosts Conference on Immigration Issues

"You have a greater concentration of wealth in developed countries and also in developing countries in the cities, " said Arnault Peral, a deputy representative of the United Nations Development Program in Mexico.

NPR: Mexico Hosts Conference on Immigration Issues