According to Marshall, the basis of consumer surplus is ______.
A
law of diminishing marginal utility
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B
law of equi-marginal utility
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C
law of proportions
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D
all of the above
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Solution
The correct option is B law of diminishing marginal utility The Law of diminishing marginal utility is a law
of economics stating that as a person increases consumption of a
product while keeping consumption of other products constant, there is a
decline in the marginal utility that person derives from consuming each additional unit of that product. This law serves as the basis for the theory of consumer's surplus.