More than half of Africa's 138,000 dollar millionaires live in South Africa, Egypt, Nigeria, Kenya and Morocco. South Africa has the most, and Johannesburg is the city with the highest number of people (14,600) with assets worth more than $1-million. Africa's wealthiest individual is Nigerian industrialist Aliko Dangote, who has a net worth of $13.5-billion. He is followed by South Africa's Johann Rupert ($10.7bn) and Nicky Oppenheimer ($8.4bn). Three-quarters of Africa's 23 dollar billionaires live in South Africa, Nigeria and Egypt – which is also where you’ll find 9 of the continent’s 10 wealthiest people.