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Market forces
1.
Copyright © 2004
South-Western The Market Forces of Supply and Demand
2.
Copyright © 2004
South-Western • Supply and demand are the two words that economists use most often. • Supply and demand are the forces that make market economies work. • Modern microeconomics is about supply, demand, and market equilibrium.
3.
Copyright © 2004
South-Western • A market is a group of buyers and sellers of a particular good or service. • The terms supply and demand refer to the behavior of people . . . as they interact with one another in markets. MARKETS AND COMPETITION
4.
Copyright © 2004
South-Western MARKETS AND COMPETITION • Buyers determine demand. • Sellers determine supply
5.
Copyright © 2004
South-Western Competitive Markets • A competitive market is a market in which there are many buyers and sellers so that each has a negligible impact on the market price.
6.
Copyright © 2004
South-Western • Perfect Competition • Products are the same • Numerous buyers and sellers so that each has no influence over price • Buyers and Sellers are price takers • Monopoly • One seller, and seller controls price Competition: Perfect and Otherwise
7.
Copyright © 2004
South-Western • Oligopoly • Few sellers • Not always aggressive competition • Monopolistic Competition • Many sellers • Slightly differentiated products • Each seller may set price for its own product Competition: Perfect and Otherwise
8.
Copyright © 2004
South-Western DEMAND • Quantity demanded is the amount of a good that buyers are willing and able to purchase. • Law of Demand • The law of demand states that, other things equal, the quantity demanded of a good falls when the price of the good rises.
9.
Copyright © 2004
South-Western The Demand Curve: The Relationship between Price and Quantity Demanded • Demand Schedule • The demand schedule is a table that shows the relationship between the price of the good and the quantity demanded.
10.
Copyright © 2004
South-Western Demand Schedule
11.
Copyright © 2004
South-Western The Demand Curve: The Relationship between Price and Quantity Demanded • Demand Curve • The demand curve is a graph of the relationship between the price of a good and the quantity demanded.
12.
Figure 1 Demand
Schedule and Demand Curve Copyright © 2004 South-Western Price of Ice-Cream Cone 0 2.50 2.00 1.50 1.00 0.50 1 2 3 4 5 6 7 8 9 10 11 Quantity of Ice-Cream Cones 3.00 12 1. A decrease in price ... 2. ... increases quantity of cones demanded.
13.
Copyright © 2004
South-Western Market Demand versus Individual Demand • Market demand refers to the sum of all individual demands for a particular good or service. • Graphically, individual demand curves are summed horizontally to obtain the market demand curve.
14.
Copyright © 2004
South-Western Shifts in the Demand Curve • Change in Quantity Demanded • Movement along the demand curve. • Caused by a change in the price of the product.
15.
Copyright © 2004
South-Western 0 D Price of Ice- Cream Cones Quantity of Ice-Cream Cones A tax that raises the price of ice-cream cones results in a movement along the demand curve. A B 8 1.00 2.00 4 Changes in Quantity Demanded
16.
Copyright © 2004
South-Western Shifts in the Demand Curve • Consumer income • Prices of related goods • Tastes • Expectations • Number of buyers
17.
Copyright © 2004
South-Western Shifts in the Demand Curve • Change in Demand • A shift in the demand curve, either to the left or right. • Caused by any change that alters the quantity demanded at every price.
18.
Figure 3 Shifts
in the Demand Curve Copyright©2003 Southwestern/Thomson Learning Price of Ice-Cream Cone Quantity of Ice-Cream Cones Increase in demand Decrease in demand Demand curve, D3 Demand curve, D1 Demand curve, D2 0
19.
Copyright © 2004
South-Western Shifts in the Demand Curve • Consumer Income • As income increases the demand for a normal good will increase. • As income increases the demand for an inferior good will decrease.
20.
Copyright © 2004
South-Western 3.00 2.50 2.00 1.50 1.00 0.50 21 3 4 5 6 7 8 9 10 1211 Price of Ice- Cream Cone Quantity of Ice-Cream Cones0 Increase in demand An increase in income... D1 D2 Consumer Income Normal Good
21.
Copyright © 2004
South-Western 3.00 2.50 2.00 1.50 1.00 0.50 21 3 4 5 6 7 8 9 10 1211 Price of Ice- Cream Cone Quantity of Ice-Cream Cones0 Decrease in demand An increase in income... D1D2 Consumer Income Inferior Good
22.
Copyright © 2004
South-Western Shifts in the Demand Curve • Prices of Related Goods • When a fall in the price of one good reduces the demand for another good, the two goods are called substitutes. • When a fall in the price of one good increases the demand for another good, the two goods are called complements.
23.
Copyright © 2004
South-Western Solve • Ketchup is a complement for burgers. If the price of burger rises, what happens to the market for ketchup? For tomatoes? For tomato juice? For orange juice?
24.
Copyright © 2004
South-Western SUPPLY • Quantity supplied is the amount of a good that sellers are willing and able to sell. • Law of Supply • The law of supply states that, other things equal, the quantity supplied of a good rises when the price of the good rises.
25.
Copyright © 2004
South-Western The Supply Curve: The Relationship between Price and Quantity Supplied • Supply Schedule • The supply schedule is a table that shows the relationship between the price of the good and the quantity supplied.
26.
Copyright © 2004
South-Western Supply Schedule
27.
Copyright © 2004
South-Western The Supply Curve: The Relationship between Price and Quantity Supplied • Supply Curve • The supply curve is the graph of the relationship between the price of a good and the quantity supplied.
28.
Figure 5 Supply
Schedule and Supply Curve Copyright©2003 Southwestern/Thomson Learning Price of Ice-Cream Cone 0 2.50 2.00 1.50 1.00 1 2 3 4 5 6 7 8 9 10 11 Quantity of Ice-Cream Cones $3.00 12 0.50 1. An increase in price... 2. ... increases quantity of cones supplied.
29.
Copyright © 2004
South-Western Market Supply versus Individual Supply • Market supply refers to the sum of all individual supplies for all sellers of a particular good or service. • Graphically, individual supply curves are summed horizontally to obtain the market supply curve.
30.
Copyright © 2004
South-Western Shifts in the Supply Curve • Input prices • Technology • Expectations • Number of sellers
31.
Copyright © 2004
South-Western Shifts in the Supply Curve • Change in Quantity Supplied • Movement along the supply curve. • Caused by a change in anything that alters the quantity supplied at each price.
32.
Copyright © 2004
South-Western 1 5 Price of Ice- Cream Cone Quantity of Ice-Cream Cones0 S 1.00 A C $3.0 0 A rise in the price of ice cream cones results in a movement along the supply curve. Change in Quantity Supplied
33.
Copyright © 2004
South-Western Shifts in the Supply Curve • Change in Supply • A shift in the supply curve, either to the left or right. • Caused by a change in a determinant other than price.
34.
Figure 7 Shifts
in the Supply Curve Copyright©2003 Southwestern/Thomson Learning Price of Ice-Cream Cone Quantity of Ice-Cream Cones 0 Increase in supply Decrease in supply Supply curve, S3 curve, Supply S1 Supply curve, S2
35.
Copyright © 2004
South-Western Solve Over the past 20 years, technological advances have reduced the cost of computer chips. How do you think this has affected the market for computers? For computer software ? For typewriters?
36.
Copyright © 2004
South-Western SUPPLY AND DEMAND TOGETHER Equilibrium refers to a situation in which the price has reached the level where quantity supplied equals quantity demanded.
37.
Copyright © 2004
South-Western SUPPLY AND DEMAND TOGETHER • Equilibrium Price • The price that balances quantity supplied and quantity demanded. • On a graph, it is the price at which the supply and demand curves intersect. • Equilibrium Quantity • The quantity supplied and the quantity demanded at the equilibrium price. • On a graph it is the quantity at which the supply and demand curves intersect.
38.
Copyright © 2004
South-Western At $2.00, the quantity demanded is equal to the quantity supplied! SUPPLY AND DEMAND TOGETHER Demand Schedule Supply Schedule
39.
Figure 8 The
Equilibrium of Supply and Demand Copyright©2003 Southwestern/Thomson Learning Price of Ice-Cream Cone 0 1 2 3 4 5 6 7 8 9 10 11 12 Quantity of Ice-Cream Cones 13 Equilibrium quantity Equilibrium price Equilibrium Supply Demand $2.00
40.
Figure 9 Markets
Not in Equilibrium Copyright©2003 Southwestern/Thomson Learning Price of Ice-Cream Cone 0 Supply Demand (a) Excess Supply Quantity demanded Quantity supplied Surplus Quantity of Ice-Cream Cones 4 $2.50 10 2.00 7
41.
Copyright © 2004
South-Western Equilibrium • Surplus • When price > equilibrium price, then quantity supplied > quantity demanded. • There is excess supply or a surplus. • Suppliers will lower the price to increase sales, thereby moving toward equilibrium.
42.
Copyright © 2004
South-Western Equilibrium • Shortage • When price < equilibrium price, then quantity demanded > the quantity supplied. • There is excess demand or a shortage. • Suppliers will raise the price due to too many buyers chasing too few goods, thereby moving toward equilibrium.
43.
Figure 9 Markets
Not in Equilibrium Copyright©2003 Southwestern/Thomson Learning Price of Ice-Cream Cone 0 Quantity of Ice-Cream Cones Supply Demand (b) Excess Demand Quantity supplied Quantity demanded 1.50 10 $2.00 74 Shortage
44.
Copyright © 2004
South-Western Equilibrium • Law of supply and demand • The claim that the price of any good adjusts to bring the quantity supplied and the quantity demanded for that good into balance.
45.
Copyright © 2004
South-Western Three Steps to Analyzing Changes in Equilibrium • Decide whether the event shifts the supply or demand curve (or both). • Decide whether the curve(s) shift(s) to the left or to the right. • Use the supply-and-demand diagram to see how the shift affects equilibrium price and quantity.
46.
Figure 10 How
an Increase in Demand Affects the Equilibrium Copyright©2003 Southwestern/Thomson Learning Price of Ice-Cream Cone 0 Quantity of Ice-Cream Cones Supply Initial equilibrium D D 3. . . . and a higher quantity sold. 2. . . . resulting in a higher price . . . 1. Hot weather increases the demand for ice cream . . . 2.00 7 New equilibrium$2.50 10
47.
Figure 11 How
a Decrease in Supply Affects the Equilibrium Copyright©2003 Southwestern/Thomson Learning Price of Ice-Cream Cone 0 Quantity of Ice-Cream Cones Demand New equilibrium Initial equilibrium S1 S2 2. . . . resulting in a higher price of ice cream . . . 1. An increase in the price of sugar reduces the supply of ice cream. . . 3. . . . and a lower quantity sold. 2.00 7 $2.50 4
48.
Table 4 What
Happens to Price and Quantity When Supply or Demand Shifts? Copyright©2004 South-Western
49.
Copyright © 2004
South-Western Solve • Using Demand and Supply diagrams, show the effect of the following events on the market for personal computers • A) The price of computer chips fall. • B) There is a rise in computer incomes • C) The price of computer software rises • D) Universities require incoming students to have their own personal computer
50.
Copyright © 2004
South-Western Solve Suppose the price of movie tickets is determined by market forces. DD and SS are given as follows: Price DD SS 4 10,000 8,000 8 8,000 8,000 12 6,000 8,000 16 4,000 8,000 20 2,000 8,000
51.
Copyright © 2004
South-Western 1) Draw the dd and ss curves. What is unusual about this supply curve? Why might this be true. 2) What are the equilibrium price and quantity. 3) Suppose the new dd schedule is price DD 4 4000 8 3000 12 2000 16 1000 20 0
52.
Copyright © 2004
South-Western • Add the old demand schedule and new demand schedule to calculate the new demand schedule . What will be the new equilibrium price and quantity.
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