If people don't have to worry with the stress of just surviving the month, they'll want to do more with their life and get more. People will always want a bigger house, nicer car, faster PC, there'll always be the motivation to find work, and when they have the freedom and ability to achive that, they'll go do it. It's one of the ways we can utilise our greedy nature in a positive way.

What UBI will do is make it so the average person isn't at the mercy of minium wage jobs that will go nowhere, just to not die on the street. An effective slave.