Chapter 3. MODERN PRINCIPLES OF ECONOMICS Third Edition
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1 Chapter 3 MODERN PRINCIPLES OF ECONOMICS Third Edition Supply and Demand
2 Outline The Demand Curve for Oil Consumer Surplus What Shifts the Demand Curve? The Supply Curve for Oil Producer Surplus What Shifts the Supply Curve? 2
3 Definition Demand Curve: A function that shows the quantity demanded at different prices. Quantity Demanded: The quantity that buyers are willing and able to buy at a particular price. 3
4 Demand Demand Price Demand for Oil Quantity Demanded $55 5 $20 25 $5 50 Quantity Demanded This table shows demand for oil -the quantities demanded at different prices. The data can be used to construct a demand curve. 4
5 Demand Curve Price of of oil oil per barrel Price Quantity Demanded $55 5 $20 25 $5 50 Quantity of oil (MBD) 5
6 Tyler Cowen and Alex Tabarrok Modern Principles: Macroeconomics, Third Edition / Modern Principles of Economics, Third Edition Copyright 2015 by Worth Publishers
7 Reading a Demand Curve A Demand Curve Can Be Read: Horizontally: At a given price, how much are people willing to buy? Vertically: What are people willing to pay for a given quantity? 7
8 Reading a Demand Curve HORIZONTAL: At $20 per barrel, buyers are willing to buy 25m barrels of oil per day. 8
9 Reading a Demand Curve VERTICAL: The maximum price that buyers are willing to pay to purchase 25m barrels per day is $20 per barrel. 9
10 Self-Check What quantity is demanded at $15? a. 10. b. 50. c. 75. $15 Answer: b
11 Self-Check At what price would 100 be demanded? a. $5. b. $1. c. $10. Answer: a. $5 $5 11
12 Law of Demand A demand curve is negatively sloped. The lower the price, the greater the quantity demanded. Demand summarizes how consumers choose to use a good, given their preferences and the possibilities for substitution. 12
13 Law of Demand. 13
14 Law of Demand For example, when the price of oil is high, consumers will use it only in its most valuable uses (e.g., gasoline and jet fuel). As the price falls, consumers will also use oil in its less valued uses (heating and rubber duckies). Consumers will buy more oil at lower prices than at higher prices. 14
15 Definition Consumer Surplus: The consumer s gain from exchange, or the difference between the maximum price a consumer is willing to pay for a certain quantity and the market price. 15
16 Definition Total Consumer Surplus: The area beneath the demand curve and above the price. Consumer Surplus: The consumer s gain from exchange, or the difference between the maximum price a consumer is willing to pay for a certain quantity and the market price. 16
17 Consumer Surplus Total consumer surplus with a linear demand curve 17
18 Self-Check What is total consumer surplus if market price is $10? a. $500. b. $700. c. $ x ($30-$10) 2 Answer: b. $
19 Shifting the Demand Curve An increase in demand shifts the demand curve to the right. At the same price, people are willing to buy more. At the same quantity, people are willing to pay a higher price. 19
20 Shifting the Demand Curve Price of oil/barrel An Increase in Demand $50 $25 Willing to pay a higher price for same quantity. Willing to buy more at the same price. New Demand Old Demand Quantity of Oil (MBD) 20
21 Shifting the Demand Curve Decrease in demand shifts the demand curve to the left. At the same price, people are willing to buy less. At the same quantity, people are willing to pay a lower price. 21
22 Shifting the Demand Curve Price of oil/barrel A Decrease in Demand Willing to buy less at the same price. $50 Willing to pay a lower price for the same quantity $25 Old Demand New Demand Quantity of Oil (MBD) 22
23 Demand Shifters Factors That Shift Demand: 1. Income 2. Population 3. Price of substitutes 4. Price of complements 5. Expectations 6. Tastes 23
24 Demand Shifters 1. Income When people get richer, they buy more stuff. When an increase in income increases the demand for a good, it is a normal good. Most goods are normal goods. When an increase in income decreases the demand for a good, it is an inferior good. 24
25 Inferior Goods 25
26 Self-Check If ipads are a normal good, when incomes increase, the demand curve for ipads will: a. Shift to the right. b. Shift to the left. c. Not change. Answer: a Higher incomes increase demand for a normal good, shifting the demand curve to the right. 26
27 Demand Shifters 2. Population An increase in population will increase demand generally. A shift in subpopulations will change the demand for specific goods and services. 27
28 Demand Shifters 3. Prices of Substitutes A substitute is a good that can be consumed instead of another good. A decrease in the price of a substitute will decrease demand for the other good. 28
29 Self-Check If orange juice and apple juice are substitutes, an increase in the price of orange juice will: a. Increase demand for apple juice. b. Decrease demand for apple juice. c. Not affect demand for apple juice. 29
30 Self-Check If orange juice and apple juice are substitutes, an increase in the price of orange juice will: Answer: a increase demand for apple juice. A higher price for orange juice will cause some people to substitute the now lower-priced apple juice. This increases the demand for apple juice. 30
31 Demand Shifters 4. Prices of Complements Complements are things that go well together. A drop in the price of a complement increases demand for the complementary good. 31
32 Demand Shifters 5. Expectations The expectation of a reduction in future supply increases the demand today. 6. Tastes Changes in tastes caused by fads, fashions, and advertising can all increase or decrease demand. 32
33 Supply Curve Price of oil per barrel Price Quantity Supplied $55 50 $20 30 $5 10 Quantity of oil (MBD) 33
34 Reading a Supply Curve A Supply Curve Can Be Read: Horizontally: At a given price, how much are suppliers willing to sell? Vertically: To produce a given quantity, what price must sellers be paid? 34
35 Definition Supply Curve: A function that shows the quantity supplied at different prices. Quantity Supplied: The quantity that sellers are willing and able to sell at a particular price. 35
36 Law of Supply Top photo: Dan Lamont/Corbis Bottom: Bettmann/Corbis As the price of oil rises, it becomes profitable to extract from more costly sources. As the price rises, the quantity supplied increases. 36
37 Self-Check At what price will producers be willing to supply 50 units? a. $10. b. $20. c. $30. Answer: a - $10 37
38 Definition Producer Surplus: The producer s gain from exchange, or the difference between the market price and the minimum price at which a producer would be willing to sell a particular quantity. 38
39 Definition Total Producer Surplus: The area above the supply curve and below the price. 39
40 Producer Surplus 40
41 Shifting the Supply Curve Increase in Supply - shifts the supply curve to the right. At the same price producers are willing to sell more. At the same quantity, producers are willing to accept a lower price 41
42 Shifting the Supply Curve Price of oil/barrel $60 Increase in supply Old supply New supply Willing to accept a lower price for the same quantity Greater quantity supplied at the same price Quantity of Oil (MBD) 42
43 Shifting the Supply Curve Decrease in supply shifts the supply curve to the left. At the same price sellers will offer less. At the same quantity, sellers demand a higher price. 43
44 Shifting the Supply Curve Price of oil/barrel $50 $28 New supply Decrease in supply Old supply Higher price required for the same quantity Smaller quantity supplied at the same price Quantity of Oil (MBD) 44
45 Supply Shifters Factors That Shift Supply: 1. Technological innovations and changes in the price of inputs 2. Taxes and subsidies 3. Expectations 4. Entry or exit of producers 5. Changes in opportunity costs 45
46 Supply Shifters 1. Technological Innovations Improvements in technology can reduce costs, thus increasing supply. A reduction in input prices also reduces costs and thus has a similar effect. Examples: computers, TVs, cars, etc 46
47 Supply Shifters 2. Taxes and Subsidies A tax on output has the same effect as an increase in costs. A subsidy is the reverse of a tax. 47
48 Supply Shifters 48
49 Supply Shifters 3. Expectations Suppliers who expect prices to increase will store goods for future sale and sell less today. The expectation of a future price increase therefore decreases current supply. Supply curve shifts to the left. 49
50 3. Expectations Supply Shifters A change in producers expectations about profitability will affect supply curves Windmill production increases as producers expect sales and profitability to increase. 50
51 Supply Shifters 4. Entry or Exit of Producers The entry of new producers increases supply, shifting the curve down and to the right. 51
52 Supply Shifters 5. Changes in Opportunity Costs An increase in opportunity costs shifts the supply curve up and to the left. If the price of wheat increases, the opportunity cost of growing soybeans increases. Some farmers will shift away from producing soybeans and start producing wheat. 52
53 Supply Shifters 5. Changes in Opportunity Costs The supply curve for soybeans will shift up and to the left. 53
54 Self-Check Suppose a new technology reduces the time it takes to assemble a car. How would this affect the supply of cars? a. Shift supply to the right. b. Shift supply to the left. c. It would have no effect on supply. 54
55 Self-Check Suppose a new technology reduces the time it takes to assemble a car. How would this affect the supply of cars? Answer: a producers would be able to supply more cars at the current price, shifting the supply curve to the right. 55
56 Takeaway A demand curve shows how customers respond to higher prices by buying less, and to lower prices by buying more. A supply curve shows how producers respond to higher prices by producing more, and to lower prices by producing less. The difference between market price and the maximum a consumer is willing to pay is the consumer s gain from exchange or consumer surplus. 56
57 Takeaway The difference between market price and the minimum price which a producer is willing to accept is the producer s gain from exchange, or producer surplus. An increase in demand means that buyers want a greater quantity at the same price or, equivalently, they are willing to pay a higher price for the same quantity. 57
58 Takeaway An increase in supply means that sellers are willing to sell a greater quantity at the same price or, equivalently, they are willing to sell a given quantity at a lower price. 58
59 Sources "Coffee with Cream and Sugar ( )" by TheCulinaryGeek from Chicago, USA -Coffee with Cream and SugarUploaded by the wub. Licensed under CC BY 2.0 via Wikimedia Commons ).jpg#mediaviewer/File:Coffee_with_Cream_and_Sugar_( ).jpg "Oh Henry bar". Via Wikimedia Commons - _Henry_bar.jpg "Kinderchocolate" by Thegreenj -Own work. Licensed under CC BY-SA 3.0 via Wikimedia Commons - inderchocolate.jpg 59
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