Reverse Income Demand Curve for an Inferior Good    To the right is the Engel curve for an inferior good with income (I) on the horizontal axis and quantity (Q) on the vertical axis.

   As you can see, the meaning of the graph is the same as before, income must reach the level I* before the good becomes inferior. One reason some economists prefer this setup is that the curve is downward sloping in the region where the good is inferior, and this may look more intuitive.

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