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In social choice theory, a preference relation over an ordered sets called single-peaked if alternatives closer to the most-preferred alternative are preferred to alternatives further away. Typically, preferences over the quantity of a numerical value (such as a tax rate, a price, or a thermostat setting) are single-peaked. For example, an individual whose most-preferred tax rate is 30% will typically prefer a tax rate of 50% to a tax rate of 80%.
Single-peaked preferences