alleryFor two goods that are perfect complements, such as a left shoe and a right shoe, the marginal rate of substitution is:
Aundefined
Balways rising
Cconstant and positive
Dequal to one
Answer & Solution
Correct answer: A. undefined
1. Perfect complements are consumed only in fixed proportions, with L-shaped indifference curves.
2. An extra unit of one good without the other adds no utility, so no substitution is possible.
3. Hence MRS is undefined, not one, constant, or rising, so those options are wrong.
_Source: ICAI BoS CA Foundation Paper 4 Business Economics, Ch 2 Unit II "Theory of Consumer Behaviour", p.16_
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