ECON 2106 Lecture Notes - Lecture 5: Riemann Sum, Inferior Good, Variety Store

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5 Feb 2021
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If a price of a good goes up or down, how will the quantity demanded change: elasticity = % change in qd / % change in price. If the good is inelastic, increase in the price causes an increase in the total revenue. If a good is elastic, then an increase in the price causes a decrease in the total revenue. If a good is unit elastic, total revenue is constant. Income elasticity of demand: how much the qd of a good changes based on the income change, elasticity = % change in qd / % change in income. If the answer is positive (income and qd went up or both went down and -/- is a positive), good is a normal good. If the answer is negative (income went up, qd went down or vice versa), good is an inferior good: sign is the most important.

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