Despite a growing backlash, the boom in migration has been mostly good for both sending and recipient countries...

Also in this special report

Of bedsheets and bison grass vodka - Rich economies gain from high levels of migration, but the benefits are unevenly spread.

The politics of the gun - Migration has once again become a touchy political issue.

Keep out - Voters like the idea of tougher borders, but the cost is high and the benefits are limited.

Send me a number - Migrants' remittances help ease poverty back home, but they are not a cure-all.

You don't have to be rich - Developing countries attract migrants too.

Circulate or integrate? - A choice of migration policies

long term - Too much or not enough?