Herd immunity When deciding whether to get vaccinated, people balance the private gains from vaccination-immunity from the disease- against the private costs But a person considering vaccination ignores the social benefits of herd immunity Since social benefits>private benefits,a private market produces fewer vaccinations than socially optimal Bhattacharya,Hyde and Tu-HealthEconomicsBhattacharya, Hyde and Tu – Health Economics Herd immunity  When deciding whether to get vaccinated, people balance the private gains from vaccination – immunity from the disease – against the private costs  But a person considering vaccination ignores the social benefits of herd immunity  Since social benefits > private benefits, a private market produces fewer vaccinations than socially optimal