There may be no single cause of bipolar disorder (aka manic depression). Instead, research indicates the causes of bipolar disorder are probably a combination of biochemical, genetic and environmental factors that may trigger and perpetuate the chemical imbalances in the brain.
Net worth: $829 million. Telecommunications mogul Strive Masiyiwa is widely regarded as the richest man in Zimbabwe and is one of the richest men in Africa with a net worth of more than US$800 million.
Also eyebrow raising was African Rainbow Minerals CEO Patrice Motsepeâs spectacular 18,5% net worth fall over the year from $2,7 billion (R31,7 billion) last year to $2,2 billion (R25,8 billion) this year. Motsepe was ranked 894 th on the global list and 5 th among SAâs richest people.SAâs wealthiest dollar billionaires are ranked as: 1  Luxury goods tycoon and Richemont chairman Johann Rupert remains the countryâs richest person with an estimated net worth of $7,4 billion (R87 billion).2  Overall Rupert is ranked the 179 th richest man in the world.Aâs wealthiest dollar billionaires are ranked as: 1  Luxury goods tycoon and Richemont chairman Johann Rupert remains the countryâs richest person with an estimated net worth of $7,4 billion (R87 billion).