Microeconomics · 免费预览
沿曲线度量弹性
在两个点之间作同样的变动时，取决于变动方向，所报告的百分比各不相同；中点法则消除了这种歧义；沿着一条直线需求曲线，随着价格下降，弹性由富有弹性变为缺乏弹性。
1. The base-rate ambiguity
The base-rate ambiguity
2. Elasticity travels along a straight line
Elasticity travels along a straight line
3. Curved demands can be constant
Curved demands can be constant
4. Elasticity at work in a formula
Elasticity at work in a formula
5. The midpoint computation
Price rises from 20 to 24 dollars and quantity falls from 100 to 80 units. Using the midpoint method, what is the arc elasticity of demand?
6. Elasticity along a line
A linear demand curve runs from 60 dollars and zero quantity down to 120 units at zero price. Where on this curve is demand unit elastic?
7. Point elasticity on a line
A demand curve is Q = 160 - 4P. Compute the point elasticity of demand at the price P = 20 dollars, using the formula E = |dQ/dP| times P/Q, and write the number.
8. Midpoints in action
Price rises from 10 to 14 dollars and quantity falls from 100 to 80 units. Using the midpoint method, what is the price elasticity of demand?
9. The linear curve's itinerary
A straight-line demand curve runs from a price of 60 at zero quantity to a quantity of 120 at zero price. How does elasticity behave along it?
10. Point elasticity at 30
A demand curve is Q = 160 - 4P. Compute the point elasticity of demand at the price P = 30 dollars using the formula slope times P over Q, and write the absolute value.