Giffen Good vs Inferior Good
Giffen Good and Inferior Good are related concepts in AP Economics that students often mix up. In short: giffen good is a Giffen good is a rare good whose quantity demanded rises when its price rises, violating the law of demand. Meanwhile, inferior good is an inferior good is a good for which demand decreases as consumers' income rises and increases as income falls. Here is how they compare side by side.
A Giffen good is a rare good whose quantity demanded rises when its price rises, violating the law of demand.
It happens with strongly inferior staple goods when a price increase makes consumers so much poorer in real terms that they buy more of the cheap staple and less of pricier substitutes. The income effect outweighs the substitution effect. Giffen goods are largely theoretical and very rare.
An inferior good is a good for which demand decreases as consumers' income rises and increases as income falls.
Inferior goods have a negative relationship between income and demand. As consumers' incomes rise, they switch to more expensive substitutes, causing demand for the inferior good to fall. Examples include generic products or public transportation.
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