Right, but people with lower incomes spend, and mostly on necessities, I think the idea is that most of those necessities would become more expensive (naturally or artificially due to price-fixing) if the poorest suddenly had more financial power. In the system as it stands, it seems to me like it'd just result in a bunch of money going to grocery giants and their suppliers, landlords, medical, etc.

Most of those are commodities, where the price is set by the cost of marginal supply.

Housing prices should go down. Housing is expensive in places with jobs and cheap in places without jobs. UBI gives people the freedom to move from the former to the latter.

Healthcare is screwed up, UBI or no.

Yeah this is the downstream effect I had in mind. You could say we'd increase supply to meet the demand but that hasn't really worked out with housing for example