If a rational utility maximizer is a net demander of a good and if an increase in its price causes him to buy more of it, then it must be an inferior good.

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If a rational utility maximizer is a net demander of a good and if an increase in its price causes him to buy more of it, then it must be an inferior good. This is because an inferior good is a good for which demand decreases as income increases. In this case, the increase in price has caused the consumer to buy more of the good, which means that the good must be an inferior good.

If a Rational Utility Maximizer Is a Net Demander of a Good