Giffen Good

A Giffen Good is a good for which demand increases when its price rises. Alfred Marshall wrote: “As Mr. Giffen has pointed out, a rise in the price of bread makes so large a drain on the resources of the poorer labouring [British spelling] families and raises so much the marginal utility of money to them, that they are forced to curtail their consumption of meat and the more expensive farinaceous foods: and, bread being still the cheapest food which they can get and will take, they consume more, and not less of it.”