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.Private benefits are measured by ______,and social benefits are measured by _____.
Definitions:
Endangered Species Act
A law enacted to protect critically endangered species from extinction as a consequence of economic growth and development untempered by adequate concern and conservation.
In Situ Conservation
Conservation methods that preserve species in their natural habitats to ensure biodiversity.
Endangered Species List
A register maintained by various organizations that catalogues animal and plant species considered to be at risk of extinction.
In Situ Conservation
Conservation methods that protect the genetic material of endangered species in their natural habitat, without moving them to new locations.
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