Marginal job market.
Okay here is an idea:
Why don't we actually find out people's marginal propensity to work rather than their marginal propensity to survive?Implement UBI and this would happen.
If there is a low demand for workers but a high demand for jobs we see what the marginal propensity to survive is: minimum wage.
Those idiot politicians that say UBI disincentivises work or that there are jobs, just not desirable ones, or that welfare or unemployment insurance is an incentive to work just don't get it and should take a class in human psychology.