Something that people consume more of when its price increases, violating the law of demand Giffen goods are named after Scottish economist Sir Robert Giffen, who was attributed as the author of this idea by Alfred Marshall in his book Principles of Economics. The classic example given by Marshall is of inferior quality staple foods, whose demand is driven by poverty that makes their purchasers unable to afford superior foodstuffs. As the price of the cheap staple rises, they can no longer afford to supplement their diet with better foods, and must consume more of the staple food
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