Comment by Simulacra
UBI will never work without stringent price controls. If a car dealer knows you are getting an extra $1000 a month, they are going to raise the price by $1000. That's just how economics works. Without the government brutally controlling the price of things, a UBI will only result in net zero. Emotionally, it feels good, but economically it's unfeasible beyond small groups.
Car dealers are free to change their offers just as consumers are free to change their demand curves. Government price controls are rarely a good answer.
UBI would have an inflationary effect, but it wouldn't be that every merchant would suddenly demand all of the UBI surplus because there are scores to hundreds of businesses that a given person buys from each month and they can't all get the full UBI increment, for at least two reasons: 1. They are jointly going to consume the UBI amount, not individually and 2. Many people would be paying higher taxes (in order to pay net UBI to people paying taxes&transfers which are zero or net-negative once UBI is included) and many of those people would see a net decrease in spendable money versus today.