Normal goods have negative income elasticities of demand, while inferior goods have positive income elasticities of demand.

Income Elasticities

Income elasticities measure how the quantity demanded of a good changes in response to a change in consumers' income.

Normal Goods

Goods for which demand increases as consumer income rises, and decreases as consumer income falls.

Inferior Goods

Goods for which demand decreases as consumer income rises, in contrast to normal goods, where demand increases with higher incomes.