For some commodities, purchases tend to decrease as the buyer's income increases.Such commodities are known as:

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Inferior goods are those for which demand decreases as income increases. These are typically lower-quality or lower-priced alternatives to other goods that consumers would prefer if they had more disposable income. Examples include generic or store-brand products, fast-food meals, and public transportation. As people earn more money, they are more likely to opt for higher-quality or more luxurious products, shifting away from inferior goods.

For Some Commodities, Purchases Tend to Decrease as the Buyer's