Participants faced a scenario where a vaccine could prevent a deadly childhood disease but also carried a risk of fatal side effects. They had to determine the maximum acceptable risk.
Only 9% of participants accepted a high risk of vaccine-related deaths, even when it matched the disease’s mortality rate.
However, this percentage rises to 47% if the vaccine-related deaths occur only among children who would have otherwise died from the disease.
People often avoid acting, even when inaction creates a greater danger.
See the full study here :
Ritov, I., & Baron, J. (1990). Reluctance to vaccinate: Omission bias and ambiguity. Journal of Behavioral Decision Making, 3(4), 263–277. https://doi.org/10.1002/bdm.3960030404
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