* Feed New York for one year, grocery expenses $500/month [1]
8000000 * $500/month * 12 month = $48 billion
18000000 * $500/month * 12 month = $108 billion // metro area
* Pay US Army soldiers for a fifth of a year [2]
$140 billion / 5 = $28 billion
Who have enough to pay that?
Contemporary athletes, even Michael Jordan ($2.1 billion [3]) absolutely can't.
But Bill Gates ($106 billion [4]) can! As well as Jeff Bezos ($114 billion).
Was antique inequality bigger? Yes! "It is believed that Marcus Licinius Crassus expanded his personal fortune to 170 million sesterces, while Pliny the Elder surmised his fortune to be valued even higher, at 200 million sesterces" [5]. That's five times bigger. And Augustus "personally owned all of Egypt". That's $898 billions [6]
[1] https://smartasset.com/mortgage/what-is-the-cost-of-living-i...
[2] https://en.wikipedia.org/wiki/Military_budget_of_the_United_...
[3] https://en.wikipedia.org/wiki/Michael_Jordan
[4] https://en.wikipedia.org/wiki/List_of_Americans_by_net_worth
[5] https://en.wikipedia.org/wiki/List_of_wealthiest_historical_...
[6] https://en.wikipedia.org/wiki/List_of_countries_by_total_wea...