Model
Herd Immunity
quote
Vaccinations provide an illustrative example that combines all these models (tragedy of the commons, free rider problem, tyranny of small decisions, public goods), plus one more: herd immunity. Diseases can spread only when they have an eligible host to infect. However, when the vast majority of people are vaccinated against a disease, there are very few eligible new hosts, since most people (in the herd) are immune from infection due to getting vaccinated. As a result, the overall public is less susceptible to outbreaks of the disease.
From
Chapter:
Anything That Can Go Wrong, Will
Section:
Harm Thy Neighbor Unintentionally
