Assume that when price is $20, quantity demanded is 9 units, and when
Assume that when price is $20, quantity demanded is 9 units, and when price is $19, quantity demanded is 10 units. Based on this information, what is the marginal revenue resulting from an increase in output from 9 units to 10 units?
A) $20
B) $19
C) $10
D) $1
ANSWER
C
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