Figure10A-5The Changing Slope of an Indifference Curve This indifference curve is downward sloping and strictly convex, implying that restaurant meals and rooms are ordinary goods for Ingrid. As Ingrid moves down along her indifference curve from V to Z, she trades reduced consumption of restaurant meals for increased consumption of housing. However, the terms of that trade-off change. As she moves from V to W, she is willing to give up 10 restaurant meals in return for 1 more room. As her consumption of rooms rises and her consumption of restaurant meals falls, she is willing to give up fewer restaurant meals in return for each additional room. The flattening of the slope as you move from left to right arises from diminishing marginal utility.