Relation

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 v(t)v(t) being concave. This 'if and only if' relationship means that preferences are convex if v(t)v(t) is concave, and conversely, if preferences are convex, then v(t)v(t) must be concave. The convexity of preferences implies a diminishing Marginal Rate of Substitution (MRS), which for this utility form is v(t)v'(t). A diminishing MRS means v(t)v'(t) decreases as tt increases, which is the definition of a concave function v(t)v(t). The formal mathematical test for the concavity of v(t)v(t) is a negative second derivative, v(t)<0v''(t) < 0. This condition ensures the indifference curve equation, c=u0v(t)c = u_0 - v(t), represents a convex curve.

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Updated 2026-05-02

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