This article does not provide any actual evidence for that idea though. In particular, the richest person in the world - and I think possibly also the one whose wealth grew the most - wasn't even a billionaire until fairly recently, and the basic investment thesis that's made his companies so valuable is that they'll take a big share of the global car market, wrecking the income of existing car companies and destroying the wealth invested in them. Actually, I think all five of the people this article is about became billionaires in the last 30 years or so, displacing the previous richest people in the world as they did so.

You've also got to remember that by focusing on the richest people in the world right now the article is effectively cherry-picking the people who've done the best in terms of wealth whilst ignoring those whose wealth has failed to grow so well.