Evaluate the two proposed answers. Which are supported? I. An effective maximum price below equilibrium — the economic interpretation: Diminishing marginal utility. II. Additional satisfaction from one more unit — the economic interpretation: Marginal utility.
Correct answer: C
I is incorrect: An effective maximum price below equilibrium → Binding price ceiling. It can create excess demand in a simple competitive model. II is correct: Additional satisfaction from one more unit → Marginal utility. Marginal concepts refer to an incremental change.