To the parent comment’s point, if UBI is evenly distributed across everyone (“Universal”) and exists as liquid spending power (“Income”), there’s no way that doesn’t result in a rate of inflation that perfectly counteracts the existence of UBI.
Prices are only low when the seller wants to scale/reach more buyers. If low/no income buyers disappear, why would prices stay low? If there were an infinite number of high income buyers, cheap products wouldn’t even exist in a freely capitalistic system. Instead we have a limited number of buyers in a wide range of income levels, which drives a wide range of prices and sellers competing at every price point.
It feels like the laws of physics, once you cut off one side of the scale it will fling in the other direction. I also hate everything I just said, I would love to exist in a world that wasn’t subject to these forces. Just seems impossible in a freely capitalistic system.