问题
单项选择题
ff the marginal benefit of the last unit of a good or service consumed was $25, the marginal benefit of the next unit consumed is most likely to be:（）
A. $25.
B. $24.
C. $26.
答案
参考答案：B
解析：
In most cases, the marginal benefit of a good or service decreases as the quantity consumed increases. So, $24 is the most likely answer. This principle is called decreasing marginal benefit.