But we'd never have to feed or house anyone again

This CBC article claims that in 2023, in Alberta Canada, a box of 50 9mm rounds cost $13 retail. That's $0.26 a shot. Multiply that by 7 billion and you get $1.8 billion.

I assume Alberta Canada is not the cheapest place to buy 9mm rounds, and that if you were buying 7 billion rounds some kind of economy of scale would kick in, and that you could get a better price even just as wholesale rather than retail. Oh and that's Canadian Dollars. But that's still an upper bound.

$1.8 billion dollars is more than I have, but is not more than anyone has.

Toronto is Canada's largest city, and is the 4th largest city in North America. In 2025 they spent about 1.8 billion Canadian dollars of their budget on "Community and Social Services" alone. That's child services, fire, paramedic, parks and rec, shelters, that sort of stuff.

I'm not advocating for shooting every human on Earth, but for the cost of parks and shelters and ambulances for a single year in the 4th largest city in North America, we could make that happen.