Joe Bob from Problem 12 Has a Cousin Don Who

Joe Bob from Problem 12 has a cousin Don who consumes goods 1 and 2. Don thinks that 3 units of good 1 is always a perfect substitute for 2 units of good 2. Which of the following utility functions is the only one that would not represent Don's preferences?

A) U(x₁, x₂) = min{ 2x₁, 3x₂}.
B) U(x₁, x₂) = 20x₁ + 30x₂ - 10,000.
C) U(x₁, x₂) = 2x₁ + 3x₂ + 1000.
D) U(x₁, x₂) = 4x²₁ + 12x₁x₂ + 9x²₂.
E) More than one of the above does not represent Don's preferences.

Correct Answer:

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