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:
Negative Reinforcement
A behavioral psychology concept involving the removal of an unpleasant stimulus to increase the likelihood of a desired response.
Conditioned Stimulus
A previously neutral stimulus that, after becoming associated with an unconditioned stimulus, eventually comes to trigger a conditioned response.
Fixed Ratio
A schedule of reinforcement where a response is reinforced only after a specified number of responses.
Classical Conditioning
A learning process that occurs through associations between an environmental stimulus and a naturally occurring stimulus.
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