Don't you think that with UBI some people could flat out refuse to be squeezed by the supermarket owner and decide to make their own grocery association not motivated by greed and so less subject to inflation? I know of several projects like this where people give their own time for free to work in that low price supermarket. It's not even registered as a company but as a public benefit association. With UBI and inflation I have no doubt this kind of thing would pop up and limit inflation.