If the marginal benefit of one more unit of a public good is $500 for Sam and $800 for Alex, the social benefit of one more unit of a public good is:
A. more than $1,300 since the benefits to society exceed the sum of individual benefits.
B. $500 since the benefit will go to the person who values it least.
C. $800 since the benefit will go to the person who values it most.
D. $1,300 since the benefit of one more unit goes to both individuals.
Answer: D
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