line—like choice N with five overnight getaways and 20 concert tickets—have more consumption of both goods.

Finally, all choices that are to the right of the vertical dashed line but below the horizontal dashed line, like

choice Q with four concerts and nine overnight getaways, involve less of the good on the vertical axis but much

more of the good on the horizontal axis.

All of these choices are theoretically possible, depending on Kimberly’s personal preferences as expressed

through the total and marginal utility she would receive from consuming these two goods. When income rises,

the most common reaction is to purchase more of both goods, like choice N, which is to the upper right relative

to Kimberly’s original choice M, although exactly how much more of each good will vary according to personal

taste. Conversely, when income falls, the most typical reaction is to purchase less of both goods. As we defined
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