Suppose that a vaccine is developed for a highly contagious strain of flu.The likelihood that anyone will get this flu decreases as more people receive the vaccine.One of the demand curves in the diagram reflects private benefits and the other reflects social benefits. 
Refer to the figure above.This externality could most effectively be corrected by:
Definitions:
College-educated Women
Women who have completed a degree at a college or university level, often associated with increased opportunities for professional and personal development.
Middle Adulthood
Refers to the period of adulthood approximately between the ages of 45 and 65, characterized by physical, psychological, and social changes, including the transition to late adulthood.
Career Change
The process of transitioning from one profession or occupational field to another, often involving retraining or updating of skills.
Life-events Approach
A psychological theory that examines how life events, including significant transitions or traumatic experiences, influence an individual's development and behavior.
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