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3qvfs2vvqbr0kcqih1ac signature-fdf8dba05031725234b8e36e0e961c6157bccbaef807cb162dad860d4cd6365c-poli-160111072252
1.
Chapter 1: Thinking
as an economistCopyright 1-1 Chapter 1 Thinking as an economist
2.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-2 Introduction • What is the optimal class size? – To maximise learning without consideration of cost? – How would considering costs change our answer? A personal tutorial course in economics might cost $20 000. A class of 300 students might cost $100 per student.
3.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-3 Introduction • What trade-offs must university administrators and students consider when choosing class size?
4.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-4 Economics: studying choice in a world of scarcity • Scarcity exists in Australia, Singapore and New Zealand! • The scarcity principle – Boundless wants cannot be satisfied with limited resources. – Therefore, having more of one thing usually means having less of another. – Because of scarcity we must make choices.
5.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-5 Economics: studying choice in a world of scarcity Scarcity Choices Wants vs. resources
6.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-6 Economics: studying choice in a world of scarcity • Economics – The study of how people make choices under conditions of scarcity and of the results of those choices for society.
7.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-7 Economics: studying choice in a world of scarcity • The cost-benefit principle – An individual (or a firm or a society) should take an action if, and only if, the extra benefits from taking the action are at least as great as the extra costs.
8.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-8 Economics: studying choice in a world of scarcity • Choosing the optimal class size revisited – Assumptions Two class sizes: 100 and 20 Introductory economics classes have 100 students – Question Should the class size be reduced to 20 students?
9.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-9 Economics: studying choice in a world of scarcity • Choosing the optimal class size – Assume The cost of a class with 20 students is $1000 per student more than a class of 100 students. – What do you think? Would it be a good idea to reduce the class size? How would you make a choice?
10.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-10 Applying the cost-benefit principle • Rational person – Someone with well-defined goals who tries to fulfill those goals as best she or he can. – This involves making a choice on the basis of costs and benefits of any action or decision. – Economists analyse the choices that people make by comparing the costs and benefits of any action or decision.
11.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-11 Applying the cost-benefit principle • Should you walk into town to save $10 on a $25 computer game? – The benefit of going into town = $10. – The cost of going into town is the dollar value of everything you give up to go into town.
12.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-12 Applying the cost-benefit principle – Estimating the cost How much could someone have to pay to walk into town? If you would walk into town for $9, the trip’s cost is $9. – The benefit ($10) exceeds the cost of ($9) of buying the game in town.
13.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-13 Applying the cost-benefit principle • Economic surplus – The benefit of taking any action minus its cost. – The goal of economic decision makers is to maximise their economic surplus.
14.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-14 Applying the cost-benefit principle • Opportunity cost – The value of the next-best alternative that must be forgone to undertake an activity. – One opportunity cost of going into town is the time you give up to go into town.
15.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-15 Applying the cost-benefit principle • Assume – The benefit of buying the game in town is $10. – The cost of making the trip is $12. • Questions – What is your economic surplus from buying the game in town? – Where should you buy the game?
16.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-16 Applying the cost-benefit principle • The role of economic models – Economic models are abstract constructs (simplified descriptions) that allow us to analyse situations in a logical way. – Other examples of abstract models A computer model of climate change A road map Analysis of an economy with two producers and two consumers
17.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-17 Four important decision pitfalls • Pitfall 1: Measure cost and benefits as absolute dollar amounts rather than as proportions. • Examples – Should you walk into town to save $10 on a $2020 laptop computer? – Which is more valuable, saving $100 on a $2000 plane ticket to Tokyo or saving $90 on a $200 plane ticket to Brisbane?
18.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-18 Four important decision pitfalls • Pitfall 2: Account for all opportunity costs. – Example Should you use your frequent-flyer coupon to fly to Manila for the spring break? – Assume Round trip airfare is $500 and is equal to your frequent flyer coupon. Other costs equal $1000. The most you are willing to pay for the Manila trip is $1350. Alternate use for the frequent-flyer coupon is to attend a wedding in Perth and the Boston airfare is $400.
19.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-19 Four important decision pitfalls • Without the coupon – Benefits = $1350 – Cost = $1400 ($400 opportunity cost + $1000 other costs) • The key to using the concept of opportunity cost correctly lies in recognising precisely what taking a given action prevents us from doing.
20.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-20 Four important decision pitfalls • Pitfall 3: Ignore sunk costs. – The only costs that should influence a decision about whether to take an action are those that we can avoid by not taking the action.
21.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-21 Four important decision pitfalls • Sunk cost A cost that is beyond recovery at the moment a decision must be made. Costs already incurred or ‘sunk’ are not relevant to your decisions. The only costs that should influence a decision about whether or not to take an action are those that we can avoid by not taking that action.
22.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-22 Four important decision pitfalls • Example How much should you eat at an `all you can eat’ restaurant? – Assume Price = $5 20 randomly selected guests will get free lunch. – Question If all diners are rational, will there be any difference in the average quantity of food consumed by these two groups?
23.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-23 Four important decision pitfalls • The entry fee to an ‘all you can eat’ restaurant is irrelevant to how much we should eat, once we have entered and paid. • Since the marginal cost is zero, we should eat up to the point where the marginal benefit of eating is zero. • Failure to observe this rule will lead to indigestion and regret (negative marginal benefit) through overeating! The emotion of greed has overcome rational thought!
24.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-24 Four important decision pitfalls • Pitfall 4: Understand the average-marginal distinction – Marginal benefit The increase in total benefit that results from carrying out one additional unit of an activity. – Marginal cost The increase in total cost that results from carrying out one additional unit of an activity.
25.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-25 Four important decision pitfalls – Average benefit The total benefit of undertaking n units of an activity divided by n. – Average cost The total cost of undertaking n units of an activity divided by n.
26.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-26 Four important decision pitfalls – Example Should NASA expand the space shuttle program from four launches per year to five? Benefits • $24 billion (average of $6 billion/launch) Costs • $20 billion (average of $5 billion/launch)
27.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-27 Four important decision pitfalls 0 0 0 0 1 3 3 3 2 7 3.5 4 3 12 4 5 4 20 5 8 5 32 6.4 12 Assume: Average benefit = Marginal benefit = $6 billion Total cost Average cost # of Launches ($ billion) ($ billion/launch) Marginal cost What is the optimal number of launches?
28.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-28 Economics: micro and macro • Microeconomics – The study of individual consumer, firm and market behaviour.
29.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-29 Economics: micro and macro • Macroeconomics – The study of the aggregate economy.
30.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-30 The approach of this text • Focus on core economic concepts • Learning economics through applications
31.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-31 Economic naturalism • Using insights from economics to help make sense of observations from everyday life. • When a major purchase is considered, families will collect more information before making the purchase. An economic naturalist can analyse why.
32.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-32 Economic naturalism • Question – Why do so many computer hardware manufacturers include more than $1000 worth of ‘free’ software with a computer selling for only slightly more than that? – Why don’t automobile manufacturers make cars without air conditioners? – Why do the keypad buttons on drive-up automatic teller machines have Braille dots?
33.
Chapter 1: Thinking
as an economistCopyright © 2007 McGraw-Hill Australia Pty Ltd PPTs t/a Principles of Microeconomics by Frank, Bernanke and Jennings Slides prepared by Nahid Khan 1-33 Economic naturalism • An economic naturalist can apply economic insights to everyday life to answer many of these questions. • Microeconomics involves two core principles to gain economic insights – Scarcity – Cost-benefit.
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