Sorry, I should have tagged my sarcasm. It should cover every person in the population. A billion dollars is enough money that you and your family for untold generations will never have to work again.
To put some math on that - assuming a market rate of return of ~7% and an inflation rate of, hell, we’ll call it 4%, that’s $30M/yr inflation adjusted forever.
You invest $30M at the same rates, and it generates $900k/yr inflation adjusted forever. That’s the combined income of 10 median families, give or take - which means a billion dollar fortune throws off enough money to comfortably support 10 families per year forever, forever.
Obviously, there are exceptions: people with severe psychopathy, for example.