1. © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. Fernando & Yvonn Quijano Prepared by: Chapter 3 Where Prices Come From: The Interaction of Demand and Supply

2. 2 of 29 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. Apple and the Demand for iPods 3.1Discuss the variables that influence demand. 3.2 Discuss the variables that influence supply. 3.3Use a graph to illustrate market equilibrium. 3.4Use demand and supply graphs to predict changes in prices and quantities. By early 2007, over 100 million iPods had been sold and more than two billion songs had been downloaded from iTunes. Clearly the strategy of selling an expensive digital music player and selling the music cheaply has been very successful for Apple. But how long will the iPod’s dominance last? Learning Objectives

3. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 3 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. Perfectly competitive market A market in which there are many buyers and sellers, all the products are identical, and there are no barriers to new sellers entering the market. Where Prices Come From: The Interaction of Demand and Supply

4. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 4 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. Demand schedule A table showing the relationship between the price of a product and the quantity of the product demanded. Quantity demanded The amount of a good or service that a consumer is willing and able to purchase at a given price. Demand curve A curve that shows the relationship between the price of a product and the quantity of the product demanded. Market demand The demand by all the consumers of a given good or service. The Demand Side of the Market Demand Schedules and Demand Curves Learning Objective 3.1

5. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 5 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. The Demand Side of the Market Learning Objective 3.1 FIGURE 3-1 A Demand Schedule and Demand Curve Demand Schedules and Demand Curves

6. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 6 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. The Demand Side of the Market Law of demand The rule that, holding everything else constant, when the price of a product falls, the quantity demanded of the product will increase, and when the price of a product rises, the quantity demanded of the product will decrease. Learning Objective 3.1 The Law of Demand

7. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 7 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. The Demand Side of the Market Substitution effect The change in the quantity demanded of a good that results from a change in price, making the good more or less expensive relative to other goods that are substitutes. Income effect The change in the quantity demanded of a good that results from the effect of a change in the good’s price on consumers’ purchasing power. Learning Objective 3.1 What Explains the Law of Demand?

8. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 8 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. The Demand Side of the Market Ceteris paribus (“all else equal”) The requirement that when analyzing the relationship between two variables—such as price and quantity demanded—other variables must be held constant. A shift of a demand curve is an increase or decrease in demand. A movement along a demand curve is an increase or decrease in the quantity demanded. Learning Objective 3.1 Holding Everything Else Constant: The Ceteris Paribus Condition

9. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 9 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. The Demand Side of the Market Learning Objective 3.1 FIGURE 3-2 Shifting the Demand Curve Holding Everything Else Constant: The Ceteris Paribus Condition

10. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 10 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. The Demand Side of the Market Learning Objective 3.1 Normal good A good for which the demand increases as income rises and decreases as income falls. Inferior good A good for which the demand increases as income falls and decreases as income rises. Variables That Shift Market Demand Income Many variables other than price can influence market demand.

11. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 11 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. The Demand Side of the Market Learning Objective 3.1 Substitutes Goods and services that can be used for the same purpose. Complements Goods and services that are used together. Variables That Shift Market Demand Price of related goods Consumers can be influenced by an advertising campaign for a product. Tastes

12. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 12 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. The Demand Side of the Market Learning Objective 3.1 Demographics The characteristics of a population with respect to age, race, and gender. Population and demographics Expected Future Prices Consumers choose not only which products to buy but also when to buy them. Variables That Shift Market Demand

13. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 13 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. The Demand Side of the Market Learning Objective 3.1 Variables That Shift Market Demand TABLE 3-1 Variables That Shift Market Demand Curves

14. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 14 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. The Demand Side of the Market Learning Objective 3.1 Variables That Shift Market Demand TABLE 3-1 Variables That Shift Market Demand Curves (continued)

15. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 15 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. Why Supermarkets Need to Understand Substitutes and Complements Making the Connection Learning Objective 3.1 COFFEE FROZEN PIZZA HOT DOGS ICE CREAM POTATO CHIPS REGULAR CEREAL SPAGHETTI SAUCEYOGURT Varieties in Five Chicago Supermarkets 391337128421285242194288 Varieties Introduced in a 2-Year Period 113109471299311470107 Varieties Removed in a 2-Year Period 135863211877753651

16. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 16 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. Companies Respond to a Growing Hispanic Population You can download Spanish music from iTunes. Apple is one of many companies responding to a growing Hispanic population. Making the Connection Learning Objective 3.1 As the demand for goods purchased by Hispanic households increases, more can be sold at every price. Not surprisingly, companies have responded by devoting more resources to serving this demographic group.

17. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 17 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. The Demand Side of the Market Learning Objective 3.1 FIGURE 3-3 A Change in Demand versus a Change in the Quantity Demanded A Change in Demand versus a Change in Quantity Demanded

18. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 18 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. Apple Forecasts the Demand for iPhones and other Consumer Electronics Will Apple’s iPhone match the success of its iPod? Making the Connection Learning Objective 3.1 To decide which products to develop, firms need to forecast the demand for those products. Time will tell whether Apple’s forecast of a large demand for the iPhone will turn out to be correct.

19. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 19 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. Supply schedule A table that shows the relationship between the price of a product and the quantity of the product supplied. Supply curve A curve that shows the relationship between the price of a product and the quantity of the product supplied. The Supply Side of the Market Learning Objective 3.2 Supply Schedules and Supply Curves Quantity supplied The amount of a good or service that a firm is willing and able to supply at a given price.

20. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 20 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. The Supply Side of the Market Learning Objective 3.2 Supply Schedules and Supply Curves FIGURE 3-4 Supply Schedule and Supply Curve

21. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 21 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. The Supply Side of the Market Law of supply The rule that, holding everything else constant, increases in price cause increases in the quantity supplied, and decreases in price cause decreases in the quantity supplied. Learning Objective 3.2 The Law of Supply

22. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 22 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. The Supply Side of the Market Learning Objective 3.2 FIGURE 3-5 Shifting the Supply Curve The Law of Supply

23. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 23 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. The Supply Side of the Market Learning Objective 3.2 Variables That Shift Supply Prices of substitutes in production Number of firms in the market Expected future prices Technological change A positive or negative change in the ability of a firm to produce a given level of output with a given quantity of inputs. The following are the most important variables that shift supply: Prices of inputs Technological change

24. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 24 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. The Supply Side of the Market Learning Objective 3.2 Variables That Shift Supply TABLE 3-2 Variables That Shift Market Supply Curves

25. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 25 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. The Supply Side of the Market Learning Objective 3.2 TABLE 3-2 Variables That Shift Market Supply Curves (continued) Variables That Shift Supply

26. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 26 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. The Supply Side of the Market Learning Objective 3.2 FIGURE 3-6 A Change in Supply versus a Change in the Quantity Supplied A Change in Supply versus a Change in Quantity Supplied

27. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 27 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. Market Equilibrium: Putting Demand and Supply Together FIGURE 3-7 Market Equilibrium Learning Objective 3.3

28. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 28 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. Market equilibrium A situation in which quantity demanded equals quantity supplied. Competitive market equilibrium A market equilibrium with many buyers and many sellers. Learning Objective 3.3 Market Equilibrium: Putting Demand and Supply Together

29. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 29 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. Market Equilibrium: Putting Demand and Supply Together Learning Objective 3.3 Surplus A situation in which the quantity supplied is greater than the quantity demanded. Shortage A situation in which the quantity demanded is greater than the quantity supplied. How Markets Eliminate Surpluses and Shortages

30. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 30 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. Market Equilibrium: Putting Demand and Supply Together Learning Objective 3.3 FIGURE 3-8 The Effect of Surpluses and Shortages on the Market Price How Markets Eliminate Surpluses and Shortages

31. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 31 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. Market Equilibrium: Putting Demand and Supply Together Learning Objective 3.3 Demand and Supply Both Count Always keep in mind that it is the interaction of demand and supply that determines the equilibrium price. Neither consumers nor firms can dictate what the equilibrium price will be. No firm can sell anything at any price unless it can find a willing buyer, and no consumer can buy anything at any price without finding a willing seller.

32. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 32 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. Solved Problem 3-3 Demand and Supply Both Count: A Tale of Two Letters Learning Objective 3.3

33. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 33 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. The Effect of Demand and Supply Shifts on Equilibrium FIGURE 3-9 The Effect of an Increase in Supply on Equilibrium The Effect of Shifts in Supply on Equilibrium Learning Objective 3.4

34. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 34 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. The Falling Price of LCD Televisions Making the Connection Learning Objective 3.4

35. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 35 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. The Effect of Demand and Supply Shifts on Equilibrium FIGURE 3-10 The Effect of an Increase in Demand on Equilibrium The Effect of Shifts in Demand on Equilibrium Learning Objective 3.4

36. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 36 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. The Effect of Demand and Supply Shifts on Equilibrium FIGURE 3-11 Shifts in Demand and Supply over Time The Effect of Shifts in Demand and Supply over Time Learning Objective 3.4

37. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 37 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. The Effect of Demand and Supply Shifts on Equilibrium TABLE 3-3 How Shifts in Demand and Supply Affect Equilibrium Price (P) and Quantity (Q) The Effect of Shifts in Demand and Supply over Time Learning Objective 3.4 SUPPLY CURVE UNCHANGED SUPPLY CURVE SHIFTS TO THE RIGHT SUPPLY CURVE SHIFTS TO THE LEFT DEMAND CURVE UNCHANGED Q unchanged P unchanged Q increases P decreases Q decreases P increases DEMAND CURVE SHIFTS TO THE RIGHTQ increases P increases Q increases P increases or decreases Q increases or decreases P increases DEMAND CURVE SHIFTS TO THE LEFT Q decreases P decreases Q increases or decreases P decreases Q decreases P decreases or increases

38. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 38 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. Solved Problem 3-4 High Demand and Low Prices in the Lobster Market? Learning Objective 3.4 Supply and demand for lobster both increase during the summer, but the increase in supply is greater than the increase in demand, therefore, equilibrium price falls.

39. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 39 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. The Effect of Demand and Supply Shifts on Equilibrium Shifts in a Curve versus Movements along a Curve Learning Objective 3.4 When analyzing markets using demand and supply curves, it is important to remember that when a shift in a demand or supply curve causes a change in equilibrium price, the change in price does not cause a further shift in demand or supply.

40. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 40 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. The Effect of Demand and Supply Shifts on Equilibrium Shifts in a Curve versus Movements along a Curve Learning Objective 3.4 Don’t Let This Happen to YOU! Remember: A Change in a Good’s Price Does Not Cause the Demand or Supply Curve to Shift

41. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 41 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. An Inside LOOK How Does the iPhone Help Apple and AT&T? Apple Coup: How Steve Jobs Played Hardball in iPhone Birth

42. Chapter 3: Where Prices Come From: The Interaction of Demand and Supply 42 of 42 © 2008 Prentice Hall Business Publishing Economics R. Glenn Hubbard, Anthony Patrick O’Brien, 2e. Ceteris paribus (“all else equal”) Competitive market equilibrium Complements Demand curve Demand schedule Demographics Income effect Inferior good Law of demand Law of supply Market demand Market equilibrium Normal good Perfectly competitive market Quantity demanded Quantity supplied Shortage Substitutes Substitution effect Supply curve Supply schedule Surplus Technological change K e y T e r m s