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Good X is an inferior good since the amount bought decreases from X1 to X2 as income increases. 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 ...
If precondition #1 is changed to "The goods in question must be so inferior that the income effect is greater than the substitution effect" then this list defines necessary and sufficient conditions. The last condition is a condition on the buyer rather than the goods itself, and thus the phenomenon is also called a "Giffen behavior".
The income effect in economics can be defined as the change in consumption resulting from a change in real income. [1] This income change can come from one of two sources: from external sources, or from income being freed up (or soaked up) by a decrease (or increase) in the price of a good that money is being spent on.
The most commonly used elasticity in economics, the price elasticity of demand, is almost always negative, but many goods have positive income elasticities, many have negative. A negative income elasticity of demand is associated with inferior goods; an increase in income will lead to a fall in the quantity demanded.
The income effect on a normal goods is negative, and if the price decreases, consequently purchasing power or income goes up. The reverse holds when price increases and purchasing power or income decreases, as a result of, so does demand. Generally, not all goods are "normal". While in an economic sense, some are inferior.
If the good is an inferior good, the income effect will offset in some degree to the substitution effect. 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 ...
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 expensive. This is also known as a Giffen good (commonly believed to be a rarity).
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.