1. What is special about today?
Bell Work
What is special about today?

2. In Lak’ech by Luis Valdez
Tu eres me otro yo Si te hago daño a ti, Me hago daño a mi mismo Si te amo y respeto Me amo y respeto yo
You are my other me If I do harm to you, I do harm to myself If I love and respect you I love and respect myself

3. What is special about today?
Bell Work
What is special about today?

4. Unit 1 Test: What is Economics?

5. What are the causes of a change in demand?
How does demand help societies determine WHAT, HOW, and FOR WHOM to produce?
What are the causes of a change in demand?

6. An Introduction to Demand
Demand depends on two variables: the price of a product and the quantity available at a given point in time.
In general, when the price of a product goes down, people are willing to buy, or demand, more of it. When the price goes up, they are willing to buy less.
A demand curve shows the quantity of a product demanded at each price that might prevail in the market.

7. The Law of Demand
The Law of Demand states that the quantity demanded of a product varies inversely with its price.
The Law of Demand is called a “law” because it has proven true after repeated studies and tests, and it is consistent with common sense and observation.
A market demand curve shows the quantities of a product demanded by everyone who is interested in purchasing it at all possible prices.

8. Demand and Its Functions
Exploration and Practice

9. Reflection
Give an example from your life when you changed the amount of a product you purchased because of a change in price?

10. Bell Work
Suppose the snack bar decided to start selling 6” diameter cookies (calling them “Kookies”) during the school day. How many Kookies would you be willing to buy per week if they cost: $0.20 $0.80 $0.40 $1.00 $0.60

11. In Lak’ech by Luis Valdez
Tu eres me otro yo Si te hago daño a ti, Me hago daño a mi mismo Si te amo y respeto Me amo y respeto yo
You are my other me If I do harm to you, I do harm to myself If I love and respect you I love and respect myself

12. Bell Work
Suppose the snack bar decided to start selling 6” diameter cookies (calling them “Kookies”) during the school day. How many Kookies would you be willing to buy per week if they cost: $0.20 $0.80 $0.40 $1.00 $0.60

14. Demand and Marginal Utility
Marginal utility is the extra satisfaction or additional usefulness obtained by acquiring multiple units of a product.
As we use more and more of a product, the extra satisfaction we get from using additional quantities begins to decline; this is known as diminishing marginal utility.
Because of diminishing marginal utility, people are not usually willing to pay as much for the second, third, or fourth unit as they did for the first unit.

15. A Change in the Quantity Demanded
The only event that can cause a change in quantity demanded is a change in price.
A change in the quantity demanded due to a change in price is represented on a demand curve as movement along the curve.
The income effect is a change in quantity demanded because of a change in price that makes consumers feel richer or poorer.
A shift in relative prices may cause a substitution effect, in which consumers substitute an alternative less expensive product for one that has become more expensive.

16. A Change in Demand
When a change in demand occurs, the entire demand curve shifts to the left or right.
A change in total consumer income affects how much of a product consumers buy at all possible prices.
The demand curve for a product shifts when consumer tastes change.
An increase in the price of a product causes an increase in demand for substitute products and a decrease in demand for the product’s complements.
Consumer expectations cause people to demand either more or less of a good.
A change in the total number of consumers causes the entire demand curve to shift right or left.

17. AC/DC Econ: Demand
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18. Exploration and Practice
Demand Shifts
Exploration and Practice

19. Demand Check In
products that may not be exactly the same but which may be put to the same use Substitutes

20. a graphic representation of the number of items that will be demanded at various prices Demand Curve

21. the willingness and ability to buy something Demand

22. a belief in future changes that affects one's willingness to buy products now Expectations

23. people will buy more units of a good at a lower price than at a higher price Law of Demand

24. anything, other than price, that affects customers' willingness to buy a product Determinant of Demand

25. How many pairs of socks would be sold at a price of $4?

26. If there were a cold spell, would the demand curve for socks move to the left or to the right?

27. Three Cases of Demand Elasticity
Demand elasticity is the extent to which a change in price causes a change in the quantity demanded.
Demand is elastic when a change in price causes a relatively larger change in quantity demanded.
Demand is inelastic when a change in price causes a relatively smaller change in quantity demanded.
Demand is unit elastic when a change in price causes a proportional change in quantity demanded.
To measure the elasticity of demand, compare the percentage change in quantity demanded to the percentage change in price.

28. The Total Expenditures Test
The total expenditures test compares the direction of a price change to the direction of change in total revenue or total expenditures.
With elastic demand, a change in price moves in the opposite direction from the change in revenue.
With unit elastic demand, there is no change in revenue, regardless of the price change.
With inelastic demand, the price and change in revenue move in the same direction.
Businesses often experiment with different prices for a new product to determine its demand elasticity; this allows the businesses to set a price that maximizes total revenues.

29. Determinants of Demand Elasticity
Demand is usually inelastic if consumers cannot postpone the purchase of a product.
When acceptable substitutes are available for a product, demand becomes more elastic.
Demand for purchases that require a large portion of income is generally more elastic than the demand for purchases that require a smaller amount of income.

30. AC/DC Econ: Elasticity of Demand
AAk

31. Exploration and Practice
Demand Elasticity
Exploration and Practice

32. Working with your partner, answer questions 1-12 on p. 123
Chapter 4 Practice
Working with your partner, answer questions 1-12 on p. 123
Questions 13, 17, 18, 19 on p. 124 are extra credit.