If the marginal utility of the 3rd cup of coffee is 23 and the marginal utility of the 4th cup is 15, then:
A. it is optimal for the consumer to have 4 cups of coffee.
B. it is optimal for the consumer to have 3 cups of coffee.
C. the price of a cup of coffee must be relatively low.
D. there is evidence of diminishing marginal utility.
Answer: D
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