ECON101 Lecture Notes - Lecture 3: Normal Good, Inferior Good
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The income elasticity of demand is a units-free measure of the responsiveness of the quantity demanded of a good to a change in consumer income when all other influences on buying plans remain the same. % change in the quantity demanded / % change in income. The change in income (m) is expressed as a % of the average income. Em = ( q / average q) / ( m / average m) The percentage increase in the quantity demanded is greater than the percentage increase in income. The percentage increase in the quantity demanded is greater than zero but less than the percentage increase in income. The quantity demanded remains the same as income increases. Normal goods: if em > 1 demand is income elastic and the good is a normal good, if 0 < em < 1 demand is income inelastic and the good is normal good. Inferior goods: if em < 0 good is an inferior good.