Consider four of the ways in which capital can move to the economies developing countries: 1) foreign direct investment (that is, having an ownership share in the investment); 2) private and equity; 3) official development assistance; and 4) remittances. Back in the mid-1990s, these four were all very roughly the same size, or at least within shouting distance of each other. But while official development assistance has risen a bit, the other three categories have all grown dramatically, as shown in the figure.
Remittances are about the same size as flows of private debt and equity. And while remittances haven't grown as fast as foreign direct investment, it has risen much more steadily and without the peaks and valleys. Remittances aren't driven by the fluctuations and trend-chasing that affect foreign direct investment and private investments in debt and equity. But remittances are affected by broad economic changes: for example, the fall in the price of oil means that remittances from Russia dropped, while the improvement in the US economy in the last few years has helped to raise remittances moving from the US to Latin America.But the
One reason for the rise in remittances is just that the total number of who have migrated to a different country has risen--although the rise in the total global number of migrants of about 50% in the last 20 years doesn't come close to explaining the rise in remittances during that time.
Another change is that it has become cheaper and easier over time for a worker to send funds back to his or her country of origin. The decline in the last few years is mild, but real. However, I suspect that if comparable statistics were available for the 1990s, the task of sending funds home would be considerably more complex and costly.
For a more detailed overview of this topic, I recommend Dean Yang's article on "Migrant Remittances" in the Spring 2011 issue of theJournal of Economic Perspectives as a starting point. (Full disclosure: I've labored in the fields as Managing Editor of JEP since the first issue in 1987.)