Here's a quick blog post with a link to more depth, on how UBI can be good for the economy. https://www.scottsantens.com/the-cost-of-universal-basic-inc...

In computing terms, I like to think that monetary flows are how the market shares information. So having more people "in the game" will increase the fidelity of the information, opening new markets. For example, discount retail might be able to serve more specialty niches.