ECON201 Lecture Notes - Lecture 2: Engel Curve, Demand Curve, Ceteris Paribus

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ECON201 Full Course Notes
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The percentage change in quantity demanded as a result of a percentage change in the consumer"s income. We can write em as em= q/q = q . If em > 0 then we have a normal good. em > 1 means a luxury good. em < 1 means a necessity. If em < 0 then we have an inferior good. Engel curves: an engel curve relates changes in income to changes in quantity demanded. For example, for a normal good, as income increases so too does quantity demanded. On the other hand, for an inferior good, as income increases the quantity demanded of the good decreases. Income (m) em = % in q = + = + . % in m + em = % in q = - = - . Engel law states that, as income increases, the percentage of income spent on certain foods declines.

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