Summary
Elasticity. An elasticity shows how responsive one variable is to changes in another variable. The price elasticity of demand, [&|eps|,&] summarizes how much the quantity demanded changes when the price changes. The responsiveness of quantity is related to the shape of a demand curve at a particular point or over a particular interval. Specifically, the price elasticity of demand is the percentage change in the quantity demanded divided by an associated percentage change in price. For example, a 1% increase in price causes the quantity demanded to fall by [&|eps||perc|.&] Downward-sloping demand curves have a negative elasticity.
The demand curve is perfectly inelastic if [&|eps||=|0,&] is inelastic if [&|eps|&] ...
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