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Unit 2: Supply, Demand, and Consumer Choice

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1 Unit 2: Supply, Demand, and Consumer Choice

2 Demand Review What are the two key aspects of the definition of demand? What is the Law of Demand? Give an example of the substitution effect Give an example of the income effect Give an example of the law of diminishing marginal utility Explain how the law of diminishing marginal utility causes the law of demand How do you determine the MARKET demand for a particular good? (from reading) Name 10 fast food places

3 This is a change in demand, not a change in quantity demanded
Shifts in Demand CHANGES IN DEMAND Ceteris paribus-“all other things held constant.” When the ceteris paribus assumption is dropped, movement no longer occurs along the demand curve. Rather, the entire demand curve shifts. A shift means that at the same prices, more people are willing and able to purchase that good. This is a change in demand, not a change in quantity demanded Changes in price DON’T shift the curve!

4 Change in Demand What if cereal makes you smarter? Demand Schedule
Price of Cereal $5 4 3 2 1 Price Quantity Demanded $5 10 $4 20 $3 30 $2 50 $1 80 Demand o Q Quantity of Cereal 4

5 Change in Demand Demand Schedule Price of Cereal $5 10 $4 20 $3 30 $2
Quantity Demanded $5 10 $4 20 $3 30 $2 50 $1 80 Demand o Q Quantity of Cereal 5

6 Change in Demand Demand Schedule Price of Cereal $5 10 $4 20 $3 30 $2
Quantity Demanded $5 10 $4 20 $3 30 $2 50 $1 80 Demand o Q Quantity of Cereal 6

7 Change in Demand Demand Schedule Price of Cereal $5 30 $4 40 $3 50 $2
1 Price Quantity Demanded $5 30 $4 40 $3 50 $2 70 $1 Demand o Q Quantity of Cereal 7

8 Prices didn’t change but people want MORE cereal
Change in Demand Demand Schedule Price of Cereal Increase in Demand Prices didn’t change but people want MORE cereal $5 4 3 2 1 Price Quantity Demanded $5 30 $4 40 $3 50 $2 70 $1 D2 Demand o Q Quantity of Cereal 8

9 Change in Demand What if cereal causes baldness? Demand Schedule
Price of Cereal $5 4 3 2 1 Price Quantity Demanded $5 10 $4 20 $3 30 $2 50 $1 80 Demand o Q Quantity of Cereal 9

10 Change in Demand Demand Schedule Price of Cereal $5 10 $4 20 $3 30 $2
Quantity Demanded $5 10 $4 20 $3 30 $2 50 $1 80 Demand o Q Quantity of Cereal 10

11 Change in Demand Demand Schedule Price of Cereal $5 10 $4 20 $3 30 $2
Quantity Demanded $5 10 $4 20 $3 30 $2 50 $1 80 Demand o Q Quantity of Cereal 11

12 Change in Demand Demand Schedule Price of Cereal $5 $4 5 $3 20 $2 30
1 Price Quantity Demanded $5 $4 5 $3 20 $2 30 $1 80 60 Demand o Q Quantity of Cereal 12

13 Prices didn’t change but people want LESS cereal
Change in Demand Demand Schedule Price of Cereal $5 4 3 2 1 Decrease in Demand Prices didn’t change but people want LESS cereal Price Quantity Demanded $5 $4 5 $3 20 $2 30 $1 80 60 D2 Demand o Q Quantity of Cereal 13

14 Change in Demand What if the price of MILK goes up? Demand Schedule
Price of Cereal $5 4 3 2 1 Price Quantity Demanded $5 10 $4 20 $3 30 $2 50 $1 80 Demand o Q Quantity of Cereal 14

15 What Causes a Shift in Demand?
5 Shifters (Determinates) of Demand: Tastes and Preferences Number of Consumers Price of Related Goods Income Future Expectations Changes in PRICE don’t shift the curve. It only causes movement along the curve.

16 Tastes and preferences
when no longer popular demand …

17 Tastes and preferences

18 Tastes and preferences

19 Prices of Related Goods
The demand curve for one good can be affected by a change in the price of ANOTHER related good. Substitutes are goods used in place of one another. If the price of one increases, the demand for the other will increase (or vice versa) Ex: If price of Pepsi falls, demand for coke will… 2. Complements are two goods that are bought and used together. If the price of one increase, the demand for the other will fall. (or vice versa) Ex: If price of peanut butter falls, demand for jelly will...

20 Substitutes 20 20

21 substitutes

22 Substitutes 22 22

23 Substitutes 23 23

24 Substitutes 24 24

25 Substitutes 25 25

26 Substitutes 26 26

27 Substitutes 27 27

28 Substitutes?

29

30 Complements 30 30

31 Complements

32 complements

33 Complements

34 What’s a compliment

35 Income The incomes of consumer change the demand, but how depends on the type of good. Normal Goods As income increases, demand increases As income falls, demand falls Ex: Luxury cars, Sea Food, jewelry, homes 2. Inferior Goods As income increases, demand falls As income falls, demand increases Ex: Top Romen, used cars, used cloths, Spam-Inferior Yachts- Normal Off Brand Cereal-Inferior McDonald’s-Inferior Toilet Paper- Probably no connection to income (The point-some products are very reliant on income and others are not)

36 Inferior Goods 36 36

37 How will predictions of the future influence demand now?
Future expectations How will predictions of the future influence demand now? If you expect prices to go up next week on milk the demand for milk this week …………

38

39 Change in Qd vs. Change in Demand
There are two ways to increase quantity from 10 to 20 Price of Cereal P A to B is a change in quantity demand (due to a change in price) A to C is a change in demand (shift in the curve) A C $3 $2 B D2 D1 o Q Cereal Quantity of Cereal

40 Practice First, identify the determinant (shifter) then decide if demand will increase or decrease Shifter Increase or Decrease Left or Right 1 2 3 4 5 6 7 8 Number of consumers, increase. Income, decrease. Substitutes, decrease. Price doesn’t shift curve, no change. Tastes and preferences, decrease. Expectations, increase. Complements, decrease.

41 Hamburgers (a normal good)
Practice First identify the determinant (Shifter). Then decide if demand will increase or decrease Hamburgers (a normal good) Population boom Incomes fall due to recession Price for Carne Asada burritos falls to $1 Price increases to $5 for hamburgers New health craze- “No ground beef” Hamburger restaurants announce that they will significantly increase prices NEXT month Government heavily taxes shake and fries causes their prices to quadruple. Restaurants lower price of burgers to $.50 Number of consumers, increase. Income, decrease. Substitutes, decrease. Price doesn’t shift curve, no change. Tastes and preferences, decrease. Expectations, increase. Complements, decrease. 41 41

42 Hamburgers (a normal good)
TOD Name the shifter and whether it is an increase or decrease in DEMAND (Not Quantity Demand) Hamburgers (a normal good) Price increases to $5 for hamburgers New health craze- “No ground beef” Hamburger restaurants announce that they will significantly increase prices NEXT month Government heavily taxes shake and fries causes their prices to quadruple. Number of consumers, increase. Income, decrease. Substitutes, decrease. Price doesn’t shift curve, no change. Tastes and preferences, decrease. Expectations, increase. Complements, decrease. 42 42

43 9/20: what are the 5 determinants that shift the demand curve?
Tony Stark Pacquiao Mr. Ski?

44 Individually or in groups Make sure your name is on it Turn it in
Work on handouts Individually or in groups Make sure your name is on it Turn it in

45 TOD Does demand or quantity demand change when the price of the good increases? Does the demand curve shift when the price of an item goes down? What is the completed definition of Demand? What is the law of demand

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