We call a billionaire’s wealth ‘uncompetitive’ when it mainly comes from industries such as gambling, construction, defence and raw materials. From 2001, when our data begin, to 2014, the uncompetitive share of billionaire wealth rose slightly. Yet over the past decade the share derived from self-made entrepreneurs in competitive sectors has surged to an all-time high (see chart 2). For the first time, half the wealth of the world’s billionaires is reasonably fairly earned. And since 2021 the total wealth derived from uncompetitive sectors has declined.