Glad to see the revival of this blog. It's a great platform.
A striking feature of Sub-Saharan Africa is fragmentation: it has some 47 countries for a smaller population than China's or India's. The national borders, drawn arbitrarily, segment goods and labor markets, and results in border-crossing costs. To some extent these costs have been noted in the context of promoting trade and investments. But not in the context of migration of people. Africa has a large number of migrants, mostly intra-regional. Its development can be facilitated by harnessing the resources of migrants.