Аннотация:Epidemiologists use certain models (SIR or SEIR models, for example) to describe the naturalevolution of an epidemic or a pandemic. The parameters of these models are based on variousassumptions regarding biological and social key parameters. In contrast to this approach,economists consider human actions as the outcome of optimizing behavior based on privatecosts and benefits. The corresponding literature can be divided into two types depending onwhether individuals are assumed to operate freely in a decentralized manner or are subject tothe public prescriptions of a central decision-maker acting as a benevolent social planner. Thispaper explores this literature and provides various examples showing, in particular, that thiseconomic approach can help to explain part of the difference between the number ofconfirmed COVID-19 infections and the number predicted by epidemiological models.