At some stage in this coming century Africa will become the global centre of population (Nigeria alone will be approaching China's population), and an educated workforce with few dependents. Plus by dint of sheer numbers, vast legions of the middle classes multiple times larger than in the West.
www.pewresearch.org
You can either continue to exploit it as the world's largest resource mine coupled to a vast underclass, or start canvassing the populace into producing and buying your products and services.
One of these is far more profitable for everyone involved, especially in the next few decades.
That tide is already turning, where investment is moving towards the latter. When China builds a transport network, hospitals, schools, universities, shopping malls, hotels, CBDs and stadia in Ethiopia, it's not doing that between the usual mines and ports, but to cater to what's already a market, and in preparation for 300 million people. Likewise the other big non-resource rich investment countries, Tanzania, Kenya, Egypt, Niger, Malawi, Rwanda, Mozambique, Ghana.
www.economist.com
Luanda in 2015-2018 was the world's most expensive city