the.com/billionaire

A person whose net worth no longer fits on a jumbotron, or in a conscience.

means A person whose personal wealth totals at least a thousand million units of currency.

from Built in English by swapping the 'm' of 'millionaire' for a 'b,' following the pattern of 'million' to 'billion.' 'Million' itself comes from Italian 'milione,' a big augmentation of 'mille' (thousand) — literally a 'great thousand.' 'Billion' was coined in French by prefixing 'bi-' (two) to mark the second power of a million, though English and French later split on whether it meant a thousand million or a million million before the shorter scale won out. 'Millionaire' was a 19th-century French import, '-aire' being the suffix for 'one characterized by,' and 'billionaire' simply rode that same suffix up a rung once fortunes got big enough to need the word.

scale check
a million seconds is 12 days, a billion is 32 years
spending test
spend $1000 daily, still need 2700 years
global count
over 2,700 exist, most made it, didn't inherit it
wealth source
over 60 percent comes from assets, not salary
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