This is interesting and I don't think that you're entirely wrong, however I do have some issues with the logic. First is that is a study of the total income of families, right? Which means that it would include multiple jobs and monetized hobbies, I don't think it really supports your conclusion that small jobs are so rare. Not only do like, of course people not work for less then 10k total, because they need more to actually live, but also plenty of people these days work multiple jobs that they view the smaller income as "worth it" for the time they spent on it. From making and selling stuff online, gig economy shit, and various teaching positions, tons of people I know work "small jobs" with small incomes that are only supplemental to their main income, these jobs wouldn't go away under UBI (In fact, I'd argue that they would probably increase). I agree you probably would have to pay more to fill positions that are unpleasant full time positions that only are paying like 15k. So there'd probably be some stratification as these jobs either disappear or become worth more but I think you would still have a fairly significant amount of people existing between the minimum and the minimum+whatever your paid for a full time job position filled by part time jobs and monetized hobbies. Basically, I disagree with the premise that people wouldn't work for a job worth under 10k, and think that plenty of people already work jobs for under $10,000, and I think jobs like that would become even more attractive if people didn't need to work for their living. And frankly looking at this data, even if you wipe out all the jobs under 30k or so, I don't think that would have a massive effect on stratification in the US. You'd get a slight pooling at the bottom, but it wouldn't be a majority of people, or even a very sizeable minority.