Equivalence of Convex Quasi-Linear Preferences and Concavity of v(t)
For quasi-linear preferences, the convexity of the indifference curves is equivalent to the function being concave. This 'if and only if' relationship means that preferences are convex if is concave, and conversely, if preferences are convex, then must be concave. The convexity of preferences implies a diminishing Marginal Rate of Substitution (MRS), which for this utility form is . A diminishing MRS means decreases as increases, which is the definition of a concave function . The formal mathematical test for the concavity of is a negative second derivative, . This condition ensures the indifference curve equation, , represents a convex curve.
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