Only really poor people will consume more. When those at the very low end of the income scale have, say, 100% more money through UBI (ignoring the actual value

Only really poor people will consume more. When those at the very low end of the income scale have, say, 100% more money through UBI (ignoring the actual value of that money, just sticking to the numbers for now), then high income earners would have 50% more, or 10% more or just 1% more, depending on their earned income. Relative to the high earning class, the poor will be able to bid more, inflation or not. A shift in resource allocation, "diverting water from golf courses to subsistence farmers", to paint a grossly simplified picture. Prices will rise, but not by the same amount as total income. (theoretically there might be a few exceptions, e.g. goods that are not very flexible in supply and target a very specific low income demographic)