Preferences and normal goods: A necessary and sufficient condition
This Note Presents a Necessary and Sufficient Condition for All Goods to Be Normal, in the Case of Differentiable Individual Demand. This Condition Appears As a Relationship Between the Quantity Effects on Marginal Willingness to Pay and Is Consequently a Characteristic of the Preference Order. It Can Be Interpreted As a Weakening of the Kind of Complementary Implied by the Leroux's Previous Sufficient Condition.
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