Here's how much money America's 10 wealthiest people would have if the US had a moderate wealth tax
Methodology: The study published in Brookings Papers on Economic Activity examines American billionaires' net worths if a moderate wealth tax had been implemented in 1982.
10. If the US had implemented a moderate wealth tax in 1982, Micheal Bloomberg's 2018 net worth would have been reduced by more than half.
Actual 2018 net worth: $51.8 billion
2018 net worth with a moderate wealth tax: $24.2 billion
The former Mayor of New York City, Bloomberg built his fortune running Bloomberg LP, his financial data and media company, Business Insider previously reported.
Read more: The fabulous life of Micheal Bloomberg
9. The net worth of Google founder Sergey Brin would have dropped by over a third.
Actual 2018 net worth: $52.4 billion
2018 net worth with a moderate wealth tax: $34.4 billion
Brin, 46, founded the search engine in a garage in California in 1998, Business Insider previously reported.
T8., T8. Billionaire brothers Charles and David Koch would each have net worths nearly $35 billion lower than they were in 2018.
Actual 2018 net worth: $53.5 billion each
2018 net worth with a moderate wealth tax: $18.9 billion each
The brothers controlled industrial giant Koch Industries and are known for their donations to conservative causes. David Koch died in August after a battle with prostate-cancer, Business Insider previously reported.
6. The net worth of Google cofounder Larry Page would be down $18.5 billion.
Actual 2018 net worth: $53.8 billion
2018 net worth with a moderate wealth tax: $35.3 billion
Page, 46, is the CEO of Google parent company Alphabet, Business Insider previously reported.
Read more: The fabulous life of Google cofounder and Alphabet CEO Larry Page
5. Oracle founder Larry Ellison would be 40% less rich if the United States had a moderate wealth tax.
Actual 2018 net worth: $58.4 billion
2018 net worth with a moderate wealth tax: $23.5 billion
Ellison, 74, is also known for having a playboy reputation, Business Insider previously reported.
4. If a moderate wealth tax had been implemented, Facebook's Mark Zuckerberg would have been worth approximately only 72% of what he actually was in 2018.
Actual 2018 net worth: $61 billion
2018 net worth with a moderate wealth tax: $44.2 billion
Zuckerberg became a billionaire at age 23 after founding the social networking site, Business Insider previously reported. At the time, he was the world's youngest self-made billionaire. That title has since been taken by Kylie Jenner, whose cosmetics line made her a billionaire at age 21.
3. Warren Buffett's fortune would be one-third the size it is.
Actual 2018 net worth: $88.3 billion
2018 net worth with a moderate wealth tax: $29.6 billion
The "Oracle of Omaha" founded and serves as the CEO of conglomerate Berkshire Hathaway, Business Insider previously reported.
Read more: 7 billionaires who have Warren Buffett to thank for their fortunes
2. A moderate wealth tax would have made Bill Gates $61 billion less rich.
Actual 2018 net worth: $97 billion
2018 net worth with a moderate wealth tax: $36.4 billion
The Microsoft founder and full-time philanthropist recently faced criticism for his connections to deceased sex offender Jeffrey Epstein, Business Insider previously reported.
1. A moderate wealth tax would have cut Jeff Bezos' fortune in half.
Actual 2018 net worth: $160 billion
2018 net worth with a moderate wealth tax: $86.8 billion
Amazon founder and CEO Jeff Bezos is currently the richest person alive. However, if the United States had a wealth tax, LVMH CEO Bernard Arnault would be richer. Arnault has a net worth of $108 billion, Business Insider previously reported.
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