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Chapter 3: Supply and Demand Curves Determine Equilibrium Price and Quantity
1.
Chapter 3 Supply and
Demand Ā© 2019 McGraw-Hill Education. All rights reserved. Authorized only for instructor use in the classroom. No reproduction or distribution without the prior written consent of McGraw-Hill Education.
2.
Ā© 2019 McGraw-Hill
Education. 2 Learning Objectives 1. Describe how the demand and supply curves summarize the behavior of buyers and sellers in the marketplace. 2. Discuss how the supply and demand curves interact to determine equilibrium price and quantity. 3. Illustrate how shifts in supply and demand curves cause prices and quantities to change 4. Explain and apply the Efficiency Principle and the Equilibrium Principle (also called the āNo-Cash- on-the-Table Principleā).
3.
Ā© 2019 McGraw-Hill
Education. 3 What, How, and for Whom? Every society answers three basic questions WHAT Which goods will be produced? How much of each? HOW Which technology? Which resources are used? FOR WHOM How are outputs distributed? ā¢ Need? ā¢ Income?
4.
Ā© 2019 McGraw-Hill
Education. 4 Central Planning versus The Market Central Planning Decisions by individuals or small groups ā¢ Agrarian societies ā¢ Government programs Sets prices and goals for the group ā¢ Individual influence is limited The Market Buyers and sellers signal wants and costs ā¢ Resources and goods are allocated accordingly Interaction of supply and demand answer the three basic questions Mixed economies use both the market and central planning
5.
Ā© 2019 McGraw-Hill
Education. 5 Buyers and Sellers in the Market The market for any good consists of all the buyers and sellers of the good Buyers and sellers have different motivations ā¢ Buyers want to benefit from the good ā¢ Sellers want to make a profit Market price balances two forces ā¢ Value buyers derive from the good ā¢ Cost to produce the good
6.
Ā© 2019 McGraw-Hill
Education. 6 Demand A demand curve illustrates the quantity buyers would purchase at each possible price Demand curves have a negative slope ā¢ Consumers buy less at higher prices ā¢ Consumers buy more at lower prices
7.
Ā© 2019 McGraw-Hill
Education. 7 Demand Slopes Downward Buyers value goods differently ā¢ The buyerās reservation price is the highest price an individual is willing to pay for a good Demand reflects the entire market, not one consumer ā¢ Lower prices bring more buyers into the market ā¢ Lower prices cause existing buyers to buy more
8.
Ā© 2019 McGraw-Hill
Education. 8 Income and Substitution Effects Buyers buy more at lower prices and buy less at higher prices What happens when price goes up? ā¢ The substitution effect: Buyers switch to substitutes when price goes up ā¢ The income effect: Buyers' overall purchasing power goes down
9.
Ā© 2019 McGraw-Hill
Education. 9 Interpreting the Demand Curve1 Horizontal interpretation of demand: ā¢ Given price, how much will buyers buy? ā¢ At a price of $4, the quantity demanded is 8,000 slices/day.
10.
Ā© 2019 McGraw-Hill
Education. 10 Interpreting the Demand Curve2 Vertical interpretation of demand: ā¢ Given the quantity to be sold, what price is the marginal consumer willing to pay? ā¢ The marginal consumer is willing to pay $4 per slice for the 8,000th slice sold in the market.
11.
Ā© 2019 McGraw-Hill
Education. 11 The Supply Curve The supply curve illustrates the quantity of a good that sellers are willing to offer at each price ā¢ If the price is less than opportunity cost, offer more Opportunity cost differs among sellers due to: ā¢ Technology ā¢ Skills ā¢ Different costs such as rent ā¢ Expectations The Low-Hanging Fruit Principle explains the upward sloping supply curve The sellerās reservation price is the lowest price the seller would be willing to sell for ā¢ Equal to marginal cost
12.
Ā© 2019 McGraw-Hill
Education. 12 Interpreting the Supply Curve1 Horizontal interpretation of supply: ā¢ Given price, how much will suppliers offer? ā¢ At a price of $2, suppliers are willing to sell 8,000 slices/day.
13.
Ā© 2019 McGraw-Hill
Education. 13 Interpreting the Supply Curve2 Vertical interpretation of supply: ā¢ Given the quantity to be sold, what is the opportunity cost of the marginal seller? ā¢ The marginal cost of producing the 8,000th slice is $2.
14.
Ā© 2019 McGraw-Hill
Education. 14 Market Equilibrium1 A system is in equilibrium when there is no tendency for it to change The equilibrium price is the price at which the supply and demand curves intersect The equilibrium quantity is the quantity at which the supply and demand curves intersect The market equilibrium occurs when all buyers and sellers are satisfied with their respective quantities at the market price ā¢ At the equilibrium price, quantity supplied equals quantity demanded
15.
Ā© 2019 McGraw-Hill
Education. 15 Market Equilibrium2 Quantity supplied equals quantity demanded AND Price is on supply and demand curves No tendency to change P or Q ā¢ Buyers are on their demand curve ā¢ Sellers are on their supply curve
16.
Ā© 2019 McGraw-Hill
Education. 16 Excess Supply and Excess Demand Excess Supply At $4, 16,000 slices supplied and 8,000 slices demanded Excess Demand At $2, 8,000 slices supplied 16,000 slices demanded
17.
Ā© 2019 McGraw-Hill
Education. 17 Incentive Principle: Excess Supply at $4 Each supplier has an incentive to decrease the price in order to sell more Lower prices decrease the surplus As price decreases: ā¢ the quantity offered for sale decreases along the supply curve ā¢ the quantity demanded increases along the demand curve
18.
Ā© 2019 McGraw-Hill
Education. 18 Incentive Principle: Excess Demand at $2 Each supplier has an incentive to increase the price in order to sell more Higher prices decrease the shortage As price increases ā¢ the quantity offered for sale increases along the supply curve ā¢ As price increases, the quantity demanded decreases along the demand curve.
19.
Ā© 2019 McGraw-Hill
Education. 19 Rent Controls Are Price Ceilings A price ceiling is a maximum allowable price, set by law Rent controls set a maximum price that can be charged for a given apartment If the controlled price is below equilibrium, then: ā¢ Quantity demanded increases ā¢ Quantity supplied decreases ā¢ A shortage results
20.
Ā© 2019 McGraw-Hill
Education. 20 Movement along the Demand Curve When price goes up, quantity demanded goes down When price goes down, buyers move to a new, higher quantity demanded A change in quantity demanded results from a change in the price of a good.
21.
Ā© 2019 McGraw-Hill
Education. 21 Shift in Demand If buyers are willing to buy more at each price, then demand has increased ā¢ Move the entire demand curve to the right ā¢ Change in demand If buyers are willing to buy less at each price, then demand has decreased
22.
Ā© 2019 McGraw-Hill
Education. 22 Movement Along the Supply Curve When price goes up, quantity supplied goes up When price goes up, sellers move to a new, higher quantity supplied A change in quantity supplied results from a change in the price of a good.
23.
Ā© 2019 McGraw-Hill
Education. 23 Shift in Supply Supply increases when sellers are willing to offer more for sale at each possible price ā¢ Moves the entire supply curve to the right Supply decreases when sellers are willing to offer less for sale at each possible price ā¢ Moves the entire supply curve to the left
24.
Ā© 2019 McGraw-Hill
Education. 24 Tennis Market If the price of renting for tennis court decreases, demand for tennis balls increases ā¢ Tennis courts and tennis balls are complements
25.
Ā© 2019 McGraw-Hill
Education. 25 Causes of Shifts in Demand Price of complementary goods ā¢ Tennis courts and tennis balls Price of substitute goods ā¢ E-mail and snail mail are substitutes Income: normal or inferior goods? Preferences ā¢ Dinosaur toys after Jurassic Park movie Number of buyers in the market Expectations about the future Price changes never cause a shift in demand
26.
Ā© 2019 McGraw-Hill
Education. 26 Apartments Near DC Metro If government wages rise, demand for apartments near Metro stations increases ā¢ Demand increases ā¢ Price increases ā¢ Quantity increases Demand for a normal good increases when income increases ā¢ Demand for an inferior good increases when income decreases
27.
Ā© 2019 McGraw-Hill
Education. 27 Causes of Shifts in Supply A change in the price of an input ā¢ Fiberglass for skateboards, construction wages A change in technology ā¢ Desktop publishing and term papers ā¢ Internet distribution of products (e-commerce) Weather (agricultural commodities and outdoor entertainment) Number of sellers in the market Expectation of future price changes Price changes never cause a shift in supply
28.
Ā© 2019 McGraw-Hill
Education. 28 Shift in Supply: Skateboards Costs of production affect the supply of a product Cost of fiberglass for skateboards increases ā¢ Supply decreases With no change in demand, the price of skateboards increases to $80 and quantity decreases to 800 Remember ā donāt think āprice went up so demand should shift left.ā Price changes never cause a shift in demand.
29.
Ā© 2019 McGraw-Hill
Education. 29 Shift in Supply: Home Construction Cost of labor used to produce houses decreases ā¢ Supply increases Demand is constant The price of houses decreases to $90,000 per house Quantity increases to 50
30.
Ā© 2019 McGraw-Hill
Education. 30 Supply and Demand Shifts: Four Rules1 1. An increase in demand will lead to an increase in both equilibrium price and quantity
31.
Ā© 2019 McGraw-Hill
Education. 31 Supply and Demand Shifts: Four Rules2 2. An decrease in demand will lead to a decrease in both equilibrium price and quantity
32.
Ā© 2019 McGraw-Hill
Education. 32 Supply and Demand Shifts: Four Rules3 3. An increase in supply will lead to a decrease in the equilibrium price and an increase in the equilibrium quantity.
33.
Ā© 2019 McGraw-Hill
Education. 33 Supply and Demand Shifts: Four Rules4 4. An decrease in supply will lead to an increase in the equilibrium price and a decrease in the equilibrium quantity.
34.
Ā© 2019 McGraw-Hill
Education. 34 Supply and Demand Both Change: Tortilla Chips1
35.
Ā© 2019 McGraw-Hill
Education. 35 Supply and Demand Both Change: Tortilla Chips2 Supply Demand Increases Decreases Increases P Depends Q Increases P Increases Q Depends Decreases P Decreases Q Depends P Depends Q Decreases
36.
Ā© 2019 McGraw-Hill
Education. 36 Efficiency and Equilibrium Markets communicate information effectively ā¢ Value buyers place on the product ā¢ Opportunity cost of producing the product Markets maximize the difference between benefits and costs (economic surplus) Market outcomes are the best provided that ā¢ The market is in equilibrium AND ā¢ No costs or benefits are shared with the public
37.
Ā© 2019 McGraw-Hill
Education. 37 Cash on the Table Buyer's surplus: buyer's reservation price minus the market price Seller's surplus: market price minus the seller's reservation price Total surplus = buyer's surplus + seller's surplus ā¢ Total surplus is buyer's reservation price ā seller's reservation price No cash on the table when surplus is maximized ā¢ No opportunity to gain from additional sales or purchases
38.
Ā© 2019 McGraw-Hill
Education. 38 Efficiency Principle The socially optimal quantity maximizes total surplus for the economy from producing and selling a good ā¢ Economic efficiency ā all goods are produced at their socially optimal level Efficiency Principle: equilibrium price and quantity are efficient if: ā¢ Sellers pay all the costs of production ā¢ Buyers receive all the benefits of their purchase Efficiency: marginal cost equals marginal benefit ā¢ Production is efficient if total surplus is maximized
39.
Ā© 2019 McGraw-Hill
Education. 39 Smart for One, Dumb for All Producers sometimes shift costs to others ā¢ Pollution is like getting free waste disposal services ā¢ Total marginal cost = seller's marginal cost plus marginal cost of pollution ā¢ When costs are shifted, supply is greater than socially optimal Buyers may create benefits for others ā¢ Marginal benefit is less than the full social benefit ā¢ Vaccinations, my neighbor's landscaping ā¢ The demand for these goods is less than socially optimal
40.
Ā© 2019 McGraw-Hill
Education. 40 Equilibrium Principle Equilibrium Principle: a market in equilibrium leaves no unexploited opportunities for individuals ā¢ BUT it may not exploit all gains achievable through collective action ā¢ Only when the seller pays the full cost of production and the buyer captures the full benefit of the good is the market outcome socially optimal ā¢ Regulation, taxes and fines, or subsidies can move the market to optimal level
41.
Ā© 2019 McGraw-Hill
Education. 41 Supply and Demand
42.
Ā© 2019 McGraw-Hill
Education. Chapter 3 Appendix The Algebra of Supply and Demand
43.
Ā© 2019 McGraw-Hill
Education. 43 From Graphs to Equations ā¦ Sample equations d P 16 2Qļ½ ļ is a straight-line demand curve with intercept 16 on the vertical (P) axis and a slope of ā2 s P 4 4Qļ½ ļ« is a straight-line supply curve with intercept 4 and a slope of 4
44.
Ā© 2019 McGraw-Hill
Education. 44 ā¦ To Equilibrium P and Q Equilibrium is where P and Q are the same for demand and supply ā¢ Set the two equations equal to each other (P = P) and solve for Q (Qs = Qd = Q*) 16 2Q 4 4Q 6Q 12 ļŖ ļŖ ļŖ ļ ļ½ ļ« ļ½ Q 2ļŖ ļ½ Use either the supply or demand curve and Q* = 2 to find price P 16 2Q P 16 2(2) ļŖ ļ½ ļ ļ½ ļ P $12ļ½
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