From this new paper:

Lastly, having long-term care insurance has no independent effect on the probability of ending up on Medicaid

Perhaps this one is not surprising to regular readers, but certainly would be to laypersons:

Thus, contrary to the predictions of various efficiency wage models of employee behavior (including gift-exchange, reciprocity, and reduced shirking), as well as those of a model where effort on pro-social tasks is a normal good with a positive income elasticity, we find that unconditional increases in salaries of incumbent teachers had no meaningful positive impact on student learning