The north will pay money to the south that they police their population and prevent them from migrating. This is an opportunity for African states to double dig: the migratory rent for helping to police the exodus of their population and at the same time they also get the remittances. African governments thus are under two pressures, from the own population and from Europe.
Stephen W. Smith on Young Africa’s Scramble For Old Europe
https://www.youtube.com/watch?v=WAQwinnb7h0
Das gilt natürlich nicht nur für Afrika.