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![Page 1: MBMC Thinking Like An Economist. MBMC Copyright c 2004 by The McGraw-Hill Companies, Inc. All rights reserved. Chapter 1: Thinking Like an Economist Slide.](https://reader030.fdocuments.net/reader030/viewer/2022032704/56649d6a5503460f94a4939a/html5/thumbnails/1.jpg)
MB MC
Thinking LikeAn EconomistThinking LikeAn Economist
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Chapter 1: Thinking Like an Economist Slide 2
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Copyright c 2004 by The McGraw-HillCompanies, Inc. All rights reserved.
Introduction
What is the Optimal Class Size?To maximize learning without consideration
of cost?How would considering costs change our
answer?A personal tutorial course in economics might
cost $20,000A class of 300 students might cost
$100/student
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Chapter 1: Thinking Like an Economist Slide 3
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Copyright c 2004 by The McGraw-HillCompanies, Inc. All rights reserved.
Introduction
What is the Optimal Class Size?What trade-offs must university
administrators and students consider when choosing class size?
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Chapter 1: Thinking Like an Economist Slide 4
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Copyright c 2004 by The McGraw-HillCompanies, Inc. All rights reserved.
Economics: StudyingChoice In a World of Scarcity
The Scarcity PrincipleBoundless 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.
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Copyright c 2004 by The McGraw-HillCompanies, Inc. All rights reserved.
Economics: StudyingChoice In a World of Scarcity
Wants vs. Resources
Scarcity
Choices
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Chapter 1: Thinking Like an Economist Slide 6
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Copyright c 2004 by The McGraw-HillCompanies, Inc. All rights reserved.
Economics: StudyingChoice 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.
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Copyright c 2004 by The McGraw-HillCompanies, Inc. All rights reserved.
Economics: StudyingChoice In a World of Scarcity
The Cost-Benefit PrincipleAn 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
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Chapter 1: Thinking Like an Economist Slide 8
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Copyright c 2004 by The McGraw-HillCompanies, Inc. All rights reserved.
Economics: StudyingChoice In a World of Scarcity
Choosing the Optimal Class Size RevisitedAssumptions:
Two class sizes: 100 and 20Introductory economics classes have 100
studentsQuestion
Should the class size be reduced to 20 students?
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Chapter 1: Thinking Like an Economist Slide 9
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Economics: StudyingChoice In a World of Scarcity
Choosing the Optimal Class SizeAssume
The cost of a class with 20 students is $1,000 per student more than a class of 100 students
What do you think Would it be a good idea to reduce the class
size?
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Applying The Cost-Benefit Principle
Rational PersonSomeone with well-defined goals who tries
to fulfill those goals as best he or she can
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Applying The Cost-Benefit Principle
Should you walk downtown to save $10 on a $25 computer game?The benefit of going downtown = $10The cost of going downtown is the dollar
value of everything you give up to go downtown
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Applying The Cost-Benefit Principle
Should you walk downtown to save $10 on a $25 computer game?Estimating the cost
How much could someone have to pay to walk downtown?
If you would walk downtown for $9, the trip’s cost is $9.
The benefit ($10) exceeds the cost of ($9) of buying the game downtown
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Applying The Cost-Benefit Principle
Economic SurplusThe benefit of taking any action minus its
cost The goal of economic decision makers is to
maximize their economic surplus
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Applying The Cost-Benefit Principle
Opportunity CostThe value of the next-best alternative that
must be forgone to undertake an activity
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Chapter 1: Thinking Like an Economist Slide 15
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Applying The Cost-Benefit Principle
AssumeThe benefit of buying the game downtown
is $10The cost of making the trip is $12
QuestionsWhat is your economic surplus from buying
the game downtown?Where should you buy the game?
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Chapter 1: Thinking Like an Economist Slide 16
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Copyright c 2004 by The McGraw-HillCompanies, Inc. All rights reserved.
Applying The Cost-Benefit Principle
The Role of Economic ModelsEconomic models are abstract constructs
(simplified descriptions) that allow us to analyze situations in a logical way
Other examples of abstract modelsA computer model of climate changeA road map
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Four Important Decision Pitfalls
Pitfall 1: Measuring cost and benefits as proportions rather than absolute dollar amounts
Examples Should you walk downtown to save $10 on
a $2,020 laptop computer?Which is more valuable, saving $100 on a
$2,000 plane ticket to Tokyo or saving $90 on a $200 plane ticket to Chicago?
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Four Important Decision Pitfalls
Pitfall 2: Ignoring Opportunity CostsExample:
Should you use your frequent-flyer coupon to fly to Fort Lauderdale for spring break?
Assume:Round trip airfare is $500 and is equal to your
frequent flyer couponOther costs equal $1,000
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Four Important Decision Pitfalls
Pitfall 2: Ignoring Opportunity CostsExample
Should you use your frequent-flyer coupon to fly to Fort Lauderdale for spring break?
Assume (continued) The most you are willing to pay for the Fort
Lauderdale trip is $1,350Alternate use for the frequent flyer coupon is to
attend a wedding in Boston and the Boston airfare is $400
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Four Important Decision Pitfalls
Pitfall 2: Ignoring Opportunity Costs Example
Should you use your frequent flyer coupon to fly to Fort Lauderdale for spring break?
oBenefits = $1,350oCost = $1,400 ($400 opportunity cost
+ $1,000 in other costs)
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Four Important Decision Pitfalls
Pitfall 2: Ignoring Opportunity Costs The key to using the concept of opportunity
cost correctly lies in recognizing precisely what taking a given action prevents us from doing.
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Four Important Decision Pitfalls
Pitfall 3: Failure To Ignore Sunk CostsThe only costs that should influence a
decision about whether to take an action are those that we can avoid by not taking the action
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Four Important Decision Pitfalls
Pitfall 3: Failure To Ignore Sunk CostsSunk cost
A cost that is beyond recovery at the moment a decision must be made
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Four Important Decision Pitfalls
Pitfall 3: Failure To Ignore Sunk CostsExample
How much should you eat at an all-you-can-eat restaurant?
Assume Price = $520 randomly selected guests will get lunch on
the house
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Four Important Decision Pitfalls
Pitfall 3: Failure To Ignore Sunk CostsExample
How much should you eat at an all-you-can-eat restaurant?
Question If all diners are rational, will there be any
difference in the average quantity of food consumed by these two groups?
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Chapter 1: Thinking Like an Economist Slide 26
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Four Important Decision Pitfalls
Pitfall 4: Failure To Understand the Average-Marginal DistinctionMarginal Benefit
The increase in total benefit that results from carrying out one additional unit of an activity
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Chapter 1: Thinking Like an Economist Slide 27
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Four Important Decision Pitfalls
Pitfall 4: Failure To Understand the Average-Marginal DistinctionMarginal Cost
The increase in total cost that results from carrying out one additional unit of an activity
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Four Important Decision Pitfalls
Pitfall 4: Failure To Understand the Average-Marginal DistinctionExample
Should NASA expand the space shuttle program from four launches per year to five?
Benefitso $24 billion (average of $6 billion/launch)
Costso $20 billion (average of $5 billion/launch)
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Four Important Decision Pitfalls
Pitfall 4: Failure To Understand the Average-Marginal DistinctionAverage Cost
The total cost of undertaking n units of an activity divided by n
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Four Important Decision Pitfalls
Pitfall 4: Failure To Understand the Average-Marginal DistinctionAverage Benefit
The total benefit of undertaking n units of an activity divided by n
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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?
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Economics: Micro and Macro
MicroeconomicsThe study of individual choice under
scarcity and its implications for the behavior of prices and quantities in individual markets
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Economics: Micro and Macro
MacroeconomicsThe study of the performance of national
economies, and of the policies that governments use to try to improve that performance
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The Approach of This Text
Focus on core economic concepts Learning economics through
applications
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Economic Naturalism
Using insights from economics to help make sense of observations from everyday life
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Economic Naturalism
QuestionWhy do so many computer hardware
manufacturers include more than $1,000 worth of “free” software with a computer selling for only slightly more than that?
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Economic Naturalism
QuestionsWhy don’t automobile manufacturers make
cars without heaters?Why do the keypad buttons on drive-up
automatic teller machines have Braille dots?
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