1. Lectures in Microeconomics-Charles W. Upton Applying the Elasticity Rules

2. A Summary

3. Applying the Elasticity Rules Some Propositions We develop these elasticity relations to make some points about how a monopolist behaves.

4. Applying the Elasticity Rules First Proposition The Monopolist will always price where demand is elastic, that is when  < -1.

5. Applying the Elasticity Rules First Proposition The Monopolist will always price where demand is elastic, that is when  < -1. Profit maximization requires MR > 0.

6. Applying the Elasticity Rules First Proposition The Monopolist will always price where demand is elastic, that is when  < -1. Profit maximization requires MR > 0.

7. Applying the Elasticity Rules First Proposition The Monopolist will always price where demand is elastic, that is when  < -1. Profit maximization requires MR > 0. The only way that can be true is if  < -1

8. Applying the Elasticity Rules First Proposition The Monopolist will always price where demand is elastic, that is when  < -1. Profit maximization requires MR > 0. The only way that can be true is if  < -1 To illustrate why, compute MR for  =-2 and  =-1/2

9. Applying the Elasticity Rules First Proposition The Monopolist will always price where demand is elastic, that is when  < -1. Profit maximization requires MR > 0. The only way that can be true is if  < -1 To illustrate why, compute MR for  = -2 and  = -½

10. Applying the Elasticity Rules Second Proposition For the straight line demand curve, MR is zero midpoint between the origin and the quantity demanded at P = 0.

11. Applying the Elasticity Rules Second Proposition For the straight line demand curve, MR is zero midpoint between the origin and the quantity demanded at P = 0. At the midpoint, we know  = -1

12. Applying the Elasticity Rules Second Proposition For the straight line demand curve, MR is zero midpoint between the origin and the quantity demanded at P = 0. At the midpoint, we know  = -1

13. Applying the Elasticity Rules First Application Suppose a firm develops a cure for cancer: one pill a day, no side effects. True or false: there would be virtually no elasticity of demand for this wonder drug.

14. Applying the Elasticity Rules First Application Suppose a firm develops a cure for cancer: one pill a day, no side effects. True or false: there would be virtually no elasticity of demand for this wonder drug.

15. Applying the Elasticity Rules First Application Suppose a firm develops a cure for cancer: one pill a day, no side effects. True or false: there would be virtually no elasticity of demand for this wonder drug. False

16. Applying the Elasticity Rules Second Application True or false: a monopolist always faces inelastic demand

17. Applying the Elasticity Rules Second Application True or false: a monopolist always faces inelastic demand.

18. Applying the Elasticity Rules Second Application True or false: a monopolist always faces inelastic demand. False

19. Applying the Elasticity Rules Third Application Wilma Trotter has shows that a new product has a price elasticity of demand of –1.25. It will cost $10 to make the product. How should the product be priced?

20. Applying the Elasticity Rules Third Application Wilma Trotter has shows that a new product has a price elasticity of demand of –1.25. It will cost $10 to make the product. How should the product be priced?

21. Applying the Elasticity Rules Third Application Wilma Trotter has shows that a new product has a price elasticity of demand of –1.25. It will cost $10 to make the product. How should the product be priced?

22. Applying the Elasticity Rules Third Application Wilma Trotter has shows that a new product has a price elasticity of demand of –1.25. It will cost $10 to make the product. How should the product be priced?

23. Applying the Elasticity Rules Third Application Wilma Trotter has shows that a new product has a price elasticity of demand of –1.25. It will cost $10 to make the product. How should the product be priced? $50

24. Applying the Elasticity Rules Fourth Application ItemRetail PriceWholesale Price Elasticity Woman’s Dress $100$50? New Car$20,000$19,000? The following data display retail prices and wholesale costs for two products. What are the price elasticities of demand?

25. Applying the Elasticity Rules Fourth Application ItemRetail PriceWholesale Price Elasticity Woman’s Dress $100$50? New Car$20,000$19,000?

26. Applying the Elasticity Rules Fourth Application ItemRetail PriceWholesale Price Elasticity Woman’s Dress $100$50 New Car$20,000$19,000?

27. Applying the Elasticity Rules Fourth Application ItemRetail PriceWholesale Price Elasticity Woman’s Dress $100$50 New Car$20,000$19,000?

28. Applying the Elasticity Rules Fourth Application ItemRetail PriceWholesale Price Elasticity Woman’s Dress $100$50 New Car$20,000$19,000?

29. Applying the Elasticity Rules Fourth Application ItemRetail PriceWholesale Price Elasticity Woman’s Dress $100$50  = -2 New Car$20,000$19,000?

30. Applying the Elasticity Rules Fourth Application ItemRetail PriceWholesale Price Elasticity Woman’s Dress $100$50  = -2 New Car$20,000$19,000

31. Applying the Elasticity Rules Fourth Application ItemRetail PriceWholesale Price Elasticity Woman’s Dress $100$50  = -2 New Car$20,000$19,000

32. Applying the Elasticity Rules Fourth Application ItemRetail PriceWholesale Price Elasticity Woman’s Dress $100$50  = -2 New Car$20,000$19,000

33. Applying the Elasticity Rules Fourth Application ItemRetail PriceWholesale Price Elasticity Woman’s Dress $100$50  = -2 New Car$20,000$19,000  = -20

34. Applying the Elasticity Rules Fifth Application Suppose it costs a monopolist $10 to make a product. True or false: If demand increases the monopolist will raise the price.

35. Applying the Elasticity Rules Fifth Application Suppose it costs a monopolist $10 to make a product. True or false: If demand increases the monopolist will raise the price. D P MC

36. Applying the Elasticity Rules Fifth Application Suppose it costs a monopolist $10 to make a product. True or false: If demand increases the monopolist will raise the price. D P D MC

37. Applying the Elasticity Rules Fifth Application Suppose it costs a monopolist $10 to make a product. True or false: If demand increases the monopolist will raise the price. D P D MC

38. Applying the Elasticity Rules Fifth Application Suppose it costs a monopolist $10 to make a product. True or false: If demand increases the monopolist will raise the price. It Depends D P D MC

39. Applying the Elasticity Rules Sixth Application Suppose it costs a monopolist $10 to make a product. True or false: If demand increases the monopolist will make more money

40. Applying the Elasticity Rules Sixth Application Suppose it costs a monopolist $10 to make a product. True or false: If demand increases the monopolist will make more money D P

41. Applying the Elasticity Rules Sixth Application Suppose it costs a monopolist $10 to make a product. True or false: If demand increases the monopolist will make more money True D P D P

42. Applying the Elasticity Rules Seventh Application True or false: it is a fair question on an exam to ask you to draw a monopolist’s supply curve.

43. Applying the Elasticity Rules Seventh Application True or false: it is a fair question on an exam to ask you to draw a monopolist’s supply curve. A fair question, but the monopolist never has a supply curve.

44. Applying the Elasticity Rules Seventh Application True or false: it is a fair question on an exam to ask you to draw a monopolist’s supply curve. A fair question, but the monopolist never has a supply curve. The amount supplied at a given price depends on elasticity, not just price.

45. Applying the Elasticity Rules End ©2004 Charles W. Upton