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FIGURE D.2 An Indifference CurveAn indifference curve is a contour line along which total utility is constant. In this case, we show all the consumption bundles that yield Ingrid 450 utils. Consumption bundle A, consisting of 3 rooms and 30 restaurant meals, yields the same total utility as bundle B, consisting of 6 rooms and 15 restaurant meals. That is, Ingrid is indifferent between bundle A and bundle B.