Moderate

Suppose we measure the quantity of good X on the horizontal axis and the quantity of good Y on the vertical axis If indifference curves are bowed inward, as we move from having an abundance of good X to having an abundance of good Y, the marginal rate of substitution of good Y for good X (the slope of the indifference curve) ?

Correct answer: A. rises

  • A. rises
  • B. stays the same
  • C. could rise or fall depending on the relative prices of the two goods.
  • D. falls

Explanation

A bowed-inward, or convex, indifference curve reflects diminishing marginal willingness to substitute one good for the other. Moving from abundant X toward abundant Y makes the curve steeper in absolute value, so the marginal rate of substitution rises.

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