If the marginal rate of substitution is not diminishing, it must mean that tastes violate convexity (assuming that our other assumptions about tastes hold).

Question

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The law of diminishing marginal rate of substitution is a basic assumption in microeconomics, stating that as an individual consumes more and more of a good, the marginal utility derived from each additional unit of the good decreases, and the individual is willing to trade less and less of the other good to get it. If the marginal rate of substitution is not diminishing, it would violate this assumption and indicate that the individual's tastes are not consistent with the law of diminishing marginal utility, which implies convexity. Therefore, if the marginal rate of substitution is not diminishing, it must mean that tastes violate convexity.

If the Marginal Rate of Substitution Is Not Diminishing, It