Suppose our consumer's income increases, and both goods are normal goods for her. As her income rises she will buy at least as much of each good.

    Since prices don't change, the budget constraint shifts outward but the slope remains -4/5. With each increase in income her purchases of SB and TD increase. When her income is $180 we show her purchasing 24 SB and 15 TD. She might chose some other bundle, this is just an example of an affordable bundle when both goods are normal.

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