Karen Sepucha, Lynn Vavreck, the Marvin Hoffenberg Professor of American Politics and Public Policy at U.C.L.A., along with Arash Naeim, Neil Wenger and Annette Stanton at the David Geffen School of Medicine at U.C.L.A. found that two strong incentives to motivate the unvaccinated, dependent on their political party affiliation. In a randomized survey experiment, a cash reward would make them more likely to get a shot if they identified as a democrat and if they didn’t need to wear a mask or social-distance in public once vaccinated they would more likely get a shot if they identified as a Republican. This work was featured in The New York Times here.