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Elasticity
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A measure of how much one economic variable responds to changes in another economic variable.
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Price Elasticity of Demand (PED)
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the percentage change in quantity demanded relative to a percentage change in price
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PED formula
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% change in Qd / % change in P
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Elastic
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when a given change in price causes a relatively larger change in quantity demanded
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Inelastic
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a given change in price causes a relatively smaller change in the quantity demanded
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Unitary Elastic
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demand whose elasticity is exactly equal to 1
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Calculating Percentage Changes
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end value-start value/start value x 100%
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when close substitutes are available, price elasticity is
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higher
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Price elasticity is higher for ____________ defined goods than for ______________ defined ones.
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narrowly, defined
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Price elasticity is higher for _____________ than for ______________.
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luxuries, necessities