ICAEW: The number of billionaires rose 15% in the last year and their combined wealth increased thanks to an improving world economy. According to Wealth-X Billionaire Census 2018, the wealth of these individuals surged by 24% to $9.2trn. The billionaire population also increased to 2,754.
Full story: https://economia.icaew.com/en/news/may-2018/number-of-billionaires-soars-worldwide