A farmer is deciding whether or not to add fertilizer to his or her crops. If the farmer adds 1 pound of fertilizer per acre, the value of the resulting crops rises from $80 to $100 per acre. According to marginal analysis, the farmer should add fertilizer if it costs less than:

A. $12.50 per pound.
B. $20 per pound.
C. $80 per pound.
D. $100 per pound.


Answer: B

Economics

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