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1. Graph the accompanying demand data, and then use the midpoint formula for E
d
to
determine price elasticity of demand for each of the four possible $1 price changes. What
can you conclude about the relationship between the slope of a curve and its elasticity?
Product Price
Quantity Demanded
$5
1
4
2
3
3
2
4
1
5
SOLUTION:
Slope does not measure elasticity. This demand curve has a constant slope of -1 (= -1/1), but elasticity
declines as we move down the curve. When the initial price is high and initial quantity is low, a unit change
in price is a low percentage while a unit change in quantity is a high percentage change. The percentage
change in quantity exceeds the percentage change in price, making demand elastic. When the initial price
is low and initial quantity is high, a unit change in price is a high percentage change while a unit change in
quantity is a low percentage change. The percentage change in quantity is less than the percentage change
in price, making demand inelastic.
Problem 2
Danny “Dimes” Donahue is a neighborhood's 9-year-old entrepreneur. His most recent venture is
selling homemade brownies that he bakes himself. At a price of $1.50 each, he sells 100. At a
price of $1 each, he sells 150. Is demand elastic or inelastic over this price range? If demand had
the same elasticity for a price decline from $1.00 to $0.50 as it does for the decline from $1.50 to
$1, would cutting the price from $1.00 to $0.50 increase or decrease Danny's total revenue?

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1. Graph the accompanying demand data, and then use the midpoint formula for Ed to determine price elasticity of demand for each of the four possible $1 price changes. What can you conclude about the relationship between the slope of a curve and its elasticity? Product Price $5 4 3 2 1 Quantity Demanded 1 2 3 4 5 SOLUTION: Slope does not measure elasticity. This demand curve has a constant slope of -1 (= -1/1), but elasticity declines as we move down the curve. When the initial price is high and initial quantity is low, a unit change in price is a low percentage while a unit change in quant ...
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