NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH
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Ernest K. Lai

Lehigh University

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Institutional Affiliation: Lehigh University

NBER Working Papers and Publications

February 2020Confirmatory Bias in Health Decisions: Evidence from the MMR-Autism Controversy
with Mengcen Qian, Shin-Yi Chou: w26772
Since Wakefield et al. (1998), the public was exposed to mixed information surrounding the claim that measles-mumps-rubella vaccine causes autism. A persistent trend to delay the vaccination during 1998–2011 in the US was driven by children of college-educated mothers, suggesting that these mothers held biases against the vaccine influenced by the early unfounded claim. Consistent with confirmatory bias, exposures to negative information about the vaccine strengthened their biases more than exposures to positive information attenuated them. Positive online information, however, had strong impacts on vaccination decisions, suggesting that online dissemination of vaccine-safety information may help tackle the sticky misinformation.

Published: Mengcen Qian & Shin-Yi Chou & Ernest K. Lai, 2020. "Confirmatory bias in health decisions: Evidence from the MMR-autism controversy," Journal of Health Economics, .

 
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