Do you have examples? The only trials I'm aware of (Canada and Finland) were not truly universal, and were done on a very small scale on a short time period, so it's hard to really gleam anything from them. I'm hoping Chicago ends up going through with their trial[0], because that will be a much more useful study.

[0]: https://www.businessinsider.com/chicago-considering-trial-fo...

There’s one in Kenya https://basicincome.org/news/2017/03/us-kenya-new-study-publ...

Also concluded ones in Namibia and in India i think