(Jeenah Moon | The New York Times) Jeff Bezos, the founder of Amazon whose net worth is now close to $200 billion, at an event in New York, Sept. 20, 2021. There are now 745 billionaires in the U.S., according to Americans for Tax Fairness and the Institute for Policy Studies, compared with 614 in March 2020 when the pandemic tightened its grip on the country (and just 66 in 1990).