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By contrast, a Giffen good is so strongly an inferior good (in higher demand at lower incomes) that the contrary income effect more than offsets the substitution effect, and the net effect of the good's price rise is to increase demand for it. This phenomenon is known as the Giffen paradox.
The substitution effect is the effect that a change in relative prices of substitute goods has on the quantity demanded. It due to a change in relative prices between two or more substitute goods. When the price of a commodity falls and prices of its substitutes remain unchanged, it becomes relatively cheaper in comparison to its substitutes.
A Giffen good is a product in greater demand when the price increases, which is also a special case of inferior goods. [5] In the extreme case of income inferiority, the size of the income effect overpowers the size of the substitution effect, leading to a positive overall change in demand responding to an increase in the price.
The substitution effect is the change that would occur if the consumer were required to remain on the original indifference curve; this is the move from A to B. The income effect is the simultaneous move from B to C that occurs because the lower price of one good in fact allows movement to a higher indifference curve.
If the good is a Giffen good, the income effect is so strong that the Marshallian quantity demanded rises when the price rises. The Hicksian demand function isolates the substitution effect by supposing the consumer is compensated with exactly enough extra income after the price rise to purchase some bundle on the same indifference curve. [ 2 ]
Substitution effect: The substitution effect is the change in the quantity demanded of a good or service due to a change in the relative prices of substitute goods. When the price of a good increases, consumers may shift their consumption to relatively cheaper substitute goods, causing the demand for the original good to decrease.
Then the income effect from the rise in purchasing power from a price fall reinforces the substitution effect. If the good is an inferior good, then the income effect will offset in some degree the substitution effect. If the income effect for an inferior good is sufficiently strong, the consumer will buy less of the good when it becomes less ...
Slutsky is principally known for work in deriving the relationships embodied in the Slutsky equation widely used in microeconomic consumer theory for separating the substitution effect and the income effect of a price change on the total quantity of a good demanded following a price change in that good, or in a related good that may have a cross-price effect on the original good quantity.