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Which one does NOT belong?

Exercise and reference answers

Questions
  1. Items
    1. Slopes downward
    2. Slopes upward
    3. Same satisfaction throughout
    4. Usually convex to origin
    Reason
    An indifference curve slopes downward, never upward. The other three are genuine properties.
    Odd item
    Slopes upward
  2. Items
    1. Budget set
    2. Budget line
    3. Marginal cost
    4. Indifference curve
    Reason
    Marginal cost belongs to the theory of the firm. The other three are consumer concepts.
    Odd item
    Marginal cost
Instructions
Tap the item that does not belong with the rest.

Explanation

_Source: syllabus Introductory Microeconomics Ch2 Consumer Behaviour, 2.3 OPTIMAL CHOICE OF THE CONSUMER_
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