We can't precisely predict the choices our consumer will make without knowing a great deal about her preferences. However, if we know which goods are normal or inferior for her we can identify the region of her budget constraint in which her new consumption bundle will be.

    If both goods are normal then consumption of both goods must increase or at least not fall as her income increases. To the right we show the region, as her income rises, in which her consumption bundle must lie if both goods are normal. On the $180 budget this region is the green portion of the constraint.

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