Existing welfare schemes do a lot to approximate a UBI scheme, just with a lot more overhead, paperwork, moral grandstanding, various other inefficiencies that

Existing welfare schemes do a lot to approximate a UBI scheme, just with a lot more overhead, paperwork, moral grandstanding, various other inefficiencies that lower the useful amounts, and stress for all involved. Still, if a UBI scheme were implemented today instead, I don't think much would change from the current status quo. It would probably provide for living comfortably enough, but not enough to buy whatever desired luxury or experience at any given moment. That's sufficient for a market to form. Whether labor activities like fixing toilets or cleaning yachts survive depends on the market price for such labor. Some activities will go away (like a well-swept shop) because the price floor is too high and automation hasn't caught up or been made cheap enough, some will just become more expensive, more and more will get automated over time.