Perhaps, but the problem with UBI being, well, universal is that everyone gets it, including those that the working poor buy from. All of a sudden the suppliers

Perhaps, but the problem with UBI being, well, universal is that everyone gets it, including those that the working poor buy from. All of a sudden the suppliers see the purchasers having more money, and they have more money themselves, so where is the disincentive to raise prices? That’s how inflation works, and it’s well known that inflation screws the working poor most of all.