Heterogeneous Risk Attitudes and Waves of Infection

Taisuke Nakata, Daisuke Fujii and Takeshi Ojima

No e192, Working Papers from Tokyo Center for Economic Research

Abstract: Many countries have experienced multiple waves of infection during the COVID-19 pandemic. We propose a novel but parsimonious extension of the SIR model, a CSIR model, that can endogenously generate waves. In the model, cautious individuals take appropriate prevention measures against the virus and are not exposed to infection risk. Incautious individuals do not take any measures and are susceptible to the risk of infection. Depending on the size of incautious and susceptible population, some cautious people lower their guard and become incautious--thus susceptible to the virus. When the virus spreads sufficiently, the population reaches ``temporary" herd immunity and infection subsides thereafter. Yet, the inflow from the cautious to the susceptible eventually expands the susceptible population and leads to the next wave. We also show that the CSIR model is isomorphic to the SIR model with time-varying parameters.

Pages: 35 pages
Date: 2023-12
New Economics Papers: this item is included in nep-hea and nep-rmg
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Citations: View citations in EconPapers (1)

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Working Paper: Heterogeneous Risk Attitudes and Waves of Infection (2022)
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