The trouble lies with the investment climate in receiving countries.
"The receiving countries can always say, 'We will get workers somewhere else,' " he said.
In addition, cooperation through diasporic groups creates opportunities abroad for the receiving countries.
Receiving countries weigh their national interests, real or perceived, against international obligations.The calculations vary from country to country.
Migrant flows are directly related to the conditions in sending countries, not to punitive measures in receiving countries.
In raw numbers, the U.S. is the largest of the receiving countries (although Spain and Norway adopt more children per capita).
The evidence suggests that it is also very much in the overall interests of the receiving countries.
The findings have important policy implications for both source countries and receiving countries.
Increasing global migration is resulting in a culturally diverse population in the receiving countries.
The only destination country that is among the main receiving countries in both dimensions is Austria.
