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The law of demand states the basic price/quantity relationship of consumption incentives. What does the concept of ‘price elasticity' add to that knowledge?

Microeconomics

13th Edition

ISBN:9781337617406

Author:Roger A. Arnold

Publisher:Roger A. Arnold

Chapter6: Elasticity

Section: Chapter Questions

Problem 2WNG: As the price of good X rises from 10 to 12, the quantity demanded of good Y rises from 100 units to...

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The law of demand states the basic price/quantity relationship of consumption incentives. What does the concept of ‘price elasticity' add to that knowledge?

Definition Definition Economic principle that states that as the price of a good or service increases, the quantity demanded by consumers decreases, while a decrease in price leads to an increase in quantity demanded, assuming all other factors affecting the demand remaining constant.

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The formula for price elasticity of demand almost looks an average rate of change, the change in demand for a change in price, except that we're using percent change. With average rate of change, the order of the two points doesn't matter, as long as it is consistent. But with percent change, the order of points can matter, because we divide the change by the original quantity. For example, we looked at changes from 50 to 75 cents, so we divided by 50 cents. If we want to consider a price reduction from 75 cents to 50 cents, we would divide by 75 cents. Would the price elasticity of demand be the same? That's what you'll explore now. The formula would change to: (а — 2) / (p1 — рә) 92 P2 Using the two data points here, compute elasticity for Boston using the formula relative to the second point. Round your answer to the nearest hundredth. Boston Subway Fare Annual Ridership (in millions) Year 1980 0.50 158 1981 0.75 143
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