If I'm selling apples, I'm selling them at whatever the market can bear. Beats me what that is. I label the price 1-for-a-dollar, and they sell out. So tomorrow I charge $2. And so on. There is no certain "price" -- price is something that's determined by the reaction of the buyers to the offers the sellers make.
That's the way it is with everything: food, rent, insurance, car repairs, drugs, services, and so forth. Everything is negotiable, and it's all dynamically determined. So if everybody in town now has an extra 10K -- or even if the poor people now have a lot more free cash, then my apple pricing experiment will yield a higher result. So I'll charge more. I'm not trying to screw over anybody, that's just the way pricing works.
The only thing you get with giving everybody a new floor for the amount of cash they have is a new floor for how much the cheapest items cost.
This is tricky to see at 5-10K, because our minds don't take into account the thousands of tiny transactions each person makes in a year and the very small amount of difference it would make with each one. So just pretend that it's 100K, or 500K. What would happen?
And that's just pricing pressure for purchasing. The same pressure would exist for employment, dramatically increasing unemployment.
It just doesn't do anything, except cause economic chaos, make all the dollar figures higher for everything, and increase unemployment. And punish those folks who don't want to participate in society. That's not a lot to be proud of.