Robert only consumes X and Y, and his indifference curves have the usual convex shape. Consider the consumption bundles (3, 9), (6, 6), and (9, 3) (hint: they lie on a straight line). If Robert is indifferent between (3, 9) and (9, 3), then:

A) he prefers (3, 9) over (6, 6).

B) he prefers (9, 3) over (6, 6).

C) he prefers (6, 6) over both (3, 9) and (9, 3).

D) he prefers (6,6) over (3,9) but not over (9,3).

C) he prefers (6, 6) over both (3, 9) and (9, 3).

Explanation:

Robert has 3 options for combinations of X and Y that is (3, 9), (6, 6), and (9, 3).

If he is indifferent to combinations (3,9) and (9,3). It means his preference is the third option (6,6).

Robert prefers to have equal combination of X and Y.

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