There's an easy solution to this. Integrate some sort of tax on rent increase. Have a threshold to allow competition but if someone is gouging then their entire

There's an easy solution to this. Integrate some sort of tax on rent increase. Have a threshold to allow competition but if someone is gouging then their entire tax bracket moves up a notch and they spend a lot more than the money they make via upping their prices. E.g. Say they sell rice at $3/lb, because of UBI they think they can sell it at $5/lb, gov't says 10% markup seems normal, but you've marked it up 200%, so you'll now pay 20% more taxes across the board --say the markup divided by 10. Of course that takes a large amount effort behind the scenes...maybe an easier method would be say to Walmart: If you forbid sales of products where they raise prices in relation to GBI we'll give you a 10% discount in taxes. Most small retailers and distributors do NOT want to lose good grace w/ walmart so they keep prices stable. Since walmart and other big retailers cover a lot of territory government only needs to make the deal with a few partners : Amazon, Walmart, Target, etc...