That is the whole issue: do we need work for people to keep themselves busy, get paid employment. I can tell you right now, that with the idiotic quest for automation and AIs replacing human brain power and skills, there will be less jobs to go around. There will be a global struggle for paid work. Best for Africa is to have birth control. The other day I saw a documentary about Nigeria, which will grow from less than 200 million inhabitants now to half a billion in 2050. No way we can provide for them, and have them emigrate en masse to Europe or North America, is no answer either. A very naive scenario the author writes about, therefore.