Credit: Kiyoshi Ota / BloombergThe Economist has quantified the better (Ms Winfrey, Mr Yanai) and worse (Mr Burns) sorts of billionaire wealth. 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 even excluding tech, the self-made billionaire share is rising. Tatyana Kim, Russia’s first female self-made billionaire, founded Wildberries, the country’s biggest online retailer, in 2004.