The problematic markets are the ones where competition is already deficient. Housing is often mentioned, but I actually don't think it'd be such a problem - if you get an UBI, you're actually much more free to move to cheaper places, rather than pushing up prices in places with jobs.
I'm not from the US, but if I was, I'd fear the cost of healthcare. Then again, that's probably unsustainable with or without UBI.
Besides, it's insane to assume that the price of a -single item- will jump to eat the entire cost of a payment such as UBI, because if that happens for every item, no one will be able to buy anything.
The $1001 candybar is just an analogy. I am _wondering_ if prices in general would adjust in a way that negates the UBI in part or whole. If 1000 is the new 0, then would pricing just adjust? I'd love to see data one way or the other on this, but am concerned that small-scale or regional studies might not be able to see this sort of effect.
Sometimes, "reducing the number of things to buy" causes inflation.
Here's an article: https://www.economicshelp.org/macroeconomics/inflation/cause...
Easy, right? Give people more money and money velocity will skyrocket.
Nope - in modern American society the acts of earning money and spending money are no longer coupled. (Which is partially why we didn't see massive consumer spending increases when the price of oil fell precipitously a few years back.)
Through credit cards and HELOCs American consumers can accumulate debt on their own schedule (and they frequently do https://www.cnbc.com/2018/02/13/total-us-household-debt-soar...) and wind it down when new cash shows up on the horizon.
Which makes money velocity unpredictable, subject to consumers' general sentiment about the economy.