Almost none of these oligarchs are worth that much money.  In truth, they are only in their jobs because they can manipulate their corporate systems at the expense of the people who actually make their companies work, if they work at all.  Virtually all corporations have two key business drivers and ONLY two: 1) shareholder value (stock price) and 2) executive compensation.  Very often CEOs achieve these goals by cutting expenses (jobs) and not corporate growth that would create more jobs.