COVID-19 Vaccine Passport and International Traveling: The Combined Effect of Two Nudges on Americans’ Support for the Pass

Immunity passports have the potential to allow large-scale international traveling resume. However, they can only become an effective tool if are widely supported by general public. We carry out a double blind randomized online experiment with sample of N=4000 Americans study (i) whether two nudges increase level support for COVID pass traveling, (ii) relationship between effects nudges, and (iii) these negative spillover on intention get vaccinated. find that both their impact is stronger when used together. Moreover, we do not negatively affect intentions Our findings important implications policymakers nascent literature interaction multiple nudges.