The Centers for Disease Control and Prevention (CDC) wants at least 90% of the population vaccinated against preventable diseases, since the chance of a disease outbreak decreases as vaccine coverage increases. We can conclude that:
A) the external benefits of vaccination likely decrease as more and more people are vaccinated.
B) the private benefits of vaccination increase with vaccine coverage.
C) vaccines create a negative externality once the vaccine covers 90% of the population.
D) vaccines create a positive externality once the vaccine covers 90% of the population.

Question

Quizplus · Accepted Answer

The external benefits of vaccination likely decrease as more people are vaccinated because the risk of disease spread diminishes, reducing the marginal benefit of additional vaccinations.

The Centers for Disease Control and Prevention (CDC) Wants at Least