Media outlets including the Wall Street Journal, Marketplace and San Francisco Chronicle reported on research co-authored by Public Policy Professor Manisha Shah that found that incentive programs — including the offer of money — have little impact on COVID-19 vaccination rates. The researchers randomly offered study participants, all members of the Medicaid program in Contra Costa County, various incentives: public health messages, vaccination appointments and either $10 or $50. Vaccination rates did not rise, and in some cases the offer of cash may have made some vaccine-hesitant people more distrustful. Shah, director of the Global Lab for Research in Action at UCLA Luskin, told the Chronicle that the financial incentive may have sent a negative signal, leading participants to think, “ ‘If I should trust the vaccine and get it, why do you have to pay me for it?’ ” The findings by the research team from UCLA, USC and Contra Costa’s Health Services agency were published by the National Bureau of Economic Research.