An annual wealth tax on the net worth of South Africa’s richest people could raise as much as R160-billion and would narrow inequality in a nation where the most affluent 1% of the population own 55% of personal wealth, a study showed. The study, carried out by groups including the World Inequality Lab of which Thomas Piketty is co-director, assessed personal wealth in South Africa and proposed a range of taxes on net wealth of above R3.82-million, or the top 1% of the population.