OK, so you introduce UBI. Yay! Now what happens to all the social workers employed by the city (say, SF)? Remember: SF spends ~$35K/homeless/year. Who pays when a homeless guy ODs and needs hospitalization? Right now government housing is subsidized for the poor (some people in SF pay $35/mo for a 2BR government apartment). Do we still have these subsidies after UBI? What about food stamps? And the 10M+ illegal immigrants?