Experts or Politicians? Citizen Responses to Vaccine Endorsements across Five OECD Countries

Who is more influential in shaping citizens' health-related behaviors, experts or politicians? We conduct five conjoint experiments on 6,255 residents of France, Germany, Spain, the United Kingdom, and the United States, asking them to evaluate COVID-19 vaccines alongside randomly varying endorsements from national politicians and medical professionals. In every country, our results show that citizens are more likely to rely on medical professionals, the experts, more than on politicians when choosing a COVID-19 vaccine. Even after accounting for citizens' political alignment with the government, our evidence reveals that politicians play a very limited role in shaping vaccine acceptance. These results have implications for the role of political elites in shaping people's behaviors amid a large-scale crisis.