Abstract
We study and SI-type model, with the possibility of vaccination, where the population is partitioned between pro-vaxxers and anti-vaxxers. We show that, during the outbreak of a disease, segregating people that are against vaccination from the rest of the population decreases the speed of recovery and may increase the number of cases. Then, we include endogenous choices based on the tradeoff between the cost of vaccinating and the risk of getting infected. We show that the results remain valid under endogenous choices, unless people are too flexible in determining their identity towards vaccination.
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