This is a challenging research problem -- perhaps harder than nutrition and diet research to answer anything definitively.<p>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&#x27;t happen if it were on a national scale).<p>On top of that, it&#x27;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.