Basic goods demand is fairly stable. Poor people will always need to pay for food, shelter, etc. Just with basic income, they won’t have to worry about how they’re going to scrape together the money next month for the rest of their lives. These inflation concerns also assume zero elasticity on the supply side, which seems odd since there is no monopoly situation on any basic good, with the exception of housing in specific areas. Fortunately, the ability to move places strongly increases with a guaranteed income too.