Risk compensation after COVID‐19 vaccination: Evidence from vaccine rollout by exact birth date in South Korea
利用韩国按出生日期分阶段接种疫苗的自然实验，通过信用卡、航空和调查数据，未发现接种后因感知风险降低而增加社交活动的风险补偿行为。
We utilize the phased rollout of COVID-19 vaccines by exact birth date in South Korea as a natural experiment for testing risk compensation. People may resume face-to-face social activities following vaccination because they perceive lower risk of infection. Applying a regression discontinuity design based on birth date cutoffs for vaccine eligibility, we find no evidence of risk-compensating behaviors, as measured by large, high-frequency data from credit card and airline companies as well as survey data. We find some evidence of self-selection into vaccine take-up based on perception toward vaccine effectiveness and side effects, but the treatment effects do not differ between compliers and never-takers.