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In economics, inferior goods are those goods the demand for which falls with increase in income of the consumer. So, there is an inverse relationship between income of the consumer and the demand for inferior goods. [1] There are many examples of inferior goods, including cheap cars, public transit options, payday lending, and
A good's Engel curve reflects its income elasticity and indicates whether the good is an inferior, normal, or luxury good. Empirical Engel curves are close to linear for some goods, and highly nonlinear for others. For normal goods, the Engel curve has a positive gradient. That is, as income increases, the quantity demanded increases.
the good in question must be an inferior good, there must be a lack of close substitute goods, and; the goods must constitute a substantial percentage of the buyer's income, but not such a substantial percentage of the buyer's income that none of the associated normal goods are consumed.
As an example, weather could be a factor in the demand for beer at a baseball game. When income increases, the demand curve for normal goods shifts outward as more will be demanded at all prices, while the demand curve for inferior goods shifts inward due to the increased
The Income elastitcty of demand thus allows goods to be broadly categorised as Normal goods and Inferior goods. A positive measurement suggests that the good is a normal good, and a negative measurement suggests an inferior good. The Income elasticity of demand effectively represents a consumers idea as to whether a good is a luxury or a necessity.
A positive income elasticity of demand is associated with normal goods; an increase in income will lead to a rise in quantity demanded. If income elasticity of demand of a commodity is less than 1, it is a necessity good. If the elasticity of demand is greater than 1, it is a luxury good or a superior good.
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] If the Hicksian demand function is steeper than the Marshallian demand, the good is a normal good; otherwise, the good is inferior.
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.