Figure 6-5 illustrates the concept of an inferior good, pizza in this example. As the consumer's income increases and the budget line shifts outward, the consumer moves from Point U to a preferred Point U' on the higher budget line. Notice that the level of pizza consumption at Point U is higher than at Point U'. As income increases, pizza consumption falls from P to P'. By definition, less of an inferior good is purchased with an increase in income. You may notice that in the two good model shown here, both goods can not be inferior.