correct. If the only way to have money to spend is to work then if nobody works nobody can buy anything. UBI is one way to make people who don't necessarily work have money to spend. Taxing the wealthy is one way to fund UBI (the other is printing money, which is basically taxing savings indiscriminately by causing inflation). I honestly don't know if that would work on practice. But the point is that merely taxing the wealthy and do nothing to address the fact that people without jobs don't get money won't fix the problem of jobs disappearing. However there is a big social and psychology barrier that prevents giving money go those who "don't deserve it" by sweating for it. On of the big drawbacks in current welfare systems though is that whoever currently benefits from them has little incentive to work a little bit because they would get the same amount of money but they'll actually have to work. The only incentive is to get a job that would pay more than what you get from welfare and that creates a barrier and also reinforces the stereotype of some people just not be willing to work (e.g. because of laziness).