>Why do our current jobs exist? Because somebody is paying for what we produce. Then we take our pay and buy what other people produce.

Because ample property and resources exist that require your (human) labor to turn into products.

If for example pumping water to AI data centers is more profitable than using it on crops and drinking water "the economy" would gladly watch you dehydrate and die. Economic short circuits such as war or governments have to step in and ensure basic human needs are met or a collapse of society can occur, and such things have occurred in the past, so this just isn't some kind of hypothetical.

Just remember there is no need for you in the post labor economy. If rich robot owners get the labor they need from other sources they'll gladly exterminate you and live in a much less populated planet.