This is a challenging research problem -- perhaps harder than nutrition and diet research to answer anything definitively. In the present, everything is connec

This is a challenging research problem -- perhaps harder than nutrition and diet research to answer anything definitively. In the present, everything is connected. Giving someone basic income may mean that they demand higher wages for, say, working as a waiter in a restaurant. But if you only give basic income to some people, then those people still benefit from low-paid waiters (which wouldn't happen if it were on a national scale). On top of that, it's a dynamic system. Traits like work ethic are partly cultural or passed down in families. Maybe the first generation of BI benefits more from work ethic, but it may decline in a few generations, perhaps undermining BI. That may not be apparent in a small study even of taken over a long time, because the participants will not be isolated from the surrounding culture.