Fig. 2

a Proportion of “other people” willing to accept conditional economic incentives as compensation for receiving a single dose of a COVID-19 vaccine. Figure shows responses from the 367 individuals who responded to the contingent valuation question: “Do you think other people would accept a gift card of $α1 as a compensation for each vaccine injection?”, where $α1 was a randomly generated incentive amount ranging from USD $5—$50. Acceptance variables were 3-level, mutually exclusive categorical responses = 3 if respondent was willing to accept incentive amount, = 2 if unsure, and = 1 if not willing to accept. b Proportion of survey respondents willing to accept conditional economic incentives as compensation for receiving a single dose of a COVID-19 vaccine. Figure shows responses from the 104 individuals who responded to the contingent valuation question: “Would you accept a gift card of $α2 as a compensation for each vaccine injection?”, where $α2 was a randomly generated incentive amount ranging from USD $5—$50. Acceptance variables were 3-level, mutually exclusive categorical responses = 3 if respondent was willing to accept incentive amount, = 2 if unsure, and = 1 if not willing to accept