ECO101: Principles of Microeconomics Introduction to the Economic Way of Thinking

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ECO101: Principles of Microeconomics Introduction to the Economic Way of Thinking Robert Gazzale, PhD Department of Economics University of Toronto robert.gazzale@utoronto.ca Gazzale (University of Toronto) ECO101: Introduction 1 / 38

Syllabus The syllabus a.k.a. the course outline If it is in the syllabus, you are responsible for it Syllabus is available on the Portal (a.k.a. Blackboard) Not yet enrolled in this course? Syllabus and course slides posted at: https://www.economics.utoronto.ca/gazzale/teaching/ Gazzale (University of Toronto) ECO101: Introduction 2 / 38

Syllabus textbooks & MobLab textbooks Krugman, Wells, Au & Parkinson; Microeconomics and Macroeconomics (both Second Canadian Edition) Special price at UofT bookstore includes MobLab access First Canadian Edition, US edition, other economics textbooks: may be acceptable substitutes for textbook, although probably do not include MobLab access. online component MobLab is required MobLab access is included with UofT-bookstore purchased textbooks Alternatively, purchase MobLab access for US$12 at https://www.moblab.com Gazzale (University of Toronto) ECO101: Introduction 3 / 38

Syllabus Lectures Mondays, Wednesdays (some Fridays) Next Friday, 15 September=Yes other Fridays only with advance notice each week s third hour=tutorial... Gazzale (University of Toronto) ECO101: Introduction 4 / 38

Syllabus These overheads a.k.a., slides, PowerPoints I annotate (write and draw on) overheads during lecture Unannotated overheads available on the Portal before lecture I will not make available annotated versions Gazzale (University of Toronto) ECO101: Introduction 5 / 38

Syllabus Goals My goals for you 1 Thinking like an economist 2 Understand some canonical models of modern economics and their implications 3 Apply these models to novel situations, understand their policy implications Gazzale (University of Toronto) ECO101: Introduction 6 / 38

Syllabus Organization My organizing principles To learn economics 1 Keep up, with ideally an initial review of the readings before lecture 2 Do problems. Lots of them. As an economist... As an economist, I believe people respond to incentives... Gazzale (University of Toronto) ECO101: Introduction 7 / 38

Assessments Syllabus Organization Date Time Weight Warm-Up Exercise Beginning of semester. 1% Tutorial Participation (Almost) every week. 4% Portal Quizzes (Almost) every week. 9% Term Test 1 Fri, 13-Oct-2017 7 9 PM 23% Term Test 2 Fri, 24-Nov-2017 5 7 PM 23% Final Examination Dec. exam period 2 hours 40% Term Tests Note time Portal quizzes First one due 18-Sep; Drop your lowest mark. Tutorials Start week of 18-Sep. Must register for MobLab beforehand. Gazzale (University of Toronto) ECO101: Introduction 8 / 38

Syllabus Organization Warm-Up Exercise Purpose To learn more about how to help promote academic and personal success. Details About 1 hour answering questions about personality traits or goals. Complete (in one sitting) by 22-Sept. Where http://warmup.utoronto.ca Marks 1% of your final grade. You earn full marks for completing the session. Gazzale (University of Toronto) ECO101: Introduction 9 / 38

Syllabus Organization Portal quizzes Start by 10:45 AM on Mondays indicated in syllabus. Quiz available preceding Thursday. One hour from time you start quiz. Access through Portal (a.k.a. Blackboard) Each quiz has approximately 10 questions, each with 4 variants For each question, you receive one randomly determined variant In-person, small-group collaboration is permitted Drop your lowest of nine quiz scores. Assume that your computer will crash in before quiz 9... Gazzale (University of Toronto) ECO101: Introduction 10 / 38

Syllabus Organization Tutorials Goals: Review and discuss concepts from lecture, to take up problems, and to participate in in-tutorial exercises Tutorial Problems and Exercises posted on Portal Please do not ask me or TAs for solutions Plenty of solved problems and multiple choice questions with solutions on the Portal Each student signs up for one tutorial section Tutorials meet almost every week (see syllabus for schedule) First meeting: week of 18-September Tutorial signup on Blackboard opens Mon, 11-Sep at 8PM First come, first served! Gazzale (University of Toronto) ECO101: Introduction 11 / 38

MobLab Syllabus Organization Online platform for economic games, markets and surveys Must have MobLab access for each tutorial Classroom response system Low stakes writing: generally full marks for sincere response Participate in games and markets: full marks for sincere participation Lowest of 10 tutorial marks dropped Complete MobLab survey by 10:30am on 19-Sept for 1 -mark bonus 4 Occasional, announced, MobLab games or markets in lecture Gazzale (University of Toronto) ECO101: Introduction 12 / 38

Syllabus Organization The Value of Consistent Effort quizzes and tutorials Results from previous years 1 Quiz and tutorial marks higher than test and exam marks 2 Better quiz performance higher test and exam marks 3 More quizzes attempted higher test (and exam) marks 4 More tutorials attended higher test (and exam) marks Gazzale (University of Toronto) ECO101: Introduction 13 / 38

Term Tests Syllabus Organization Term tests: Fridays evenings Academic conflict? We will announce procedure for alternate seating. Missed term test? If approved by Prof. Gazzale, you will take a cumulative makeup test on Friday 1-Dec from 9 11 AM If missed due to medial reason, approval only if licensed practitioner confirms you were unable to take test Makeup test can only count towards 1 missed term test Gazzale (University of Toronto) ECO101: Introduction 14 / 38

Syllabus Organization Final Grades in ECO101Y Historically, average final grade across all sections of Economics 100/101/102 is C+ The average final grade in each section will vary to reflect the relative performance of students in that section on the common part of the final examination (multiple choice questions worth 40% of final exam grade). Bottom line: students in a section where the average grade on a term test is low are NOT disadvantaged Gazzale (University of Toronto) ECO101: Introduction 15 / 38

Syllabus Organization ECO101 Assistance Gluskin = 150 St. George Street Seek out help while not underestimating the value of struggle. Prof. G. office hours (Gluskin Room 330) Wednesdays, 2:30 PM 3:30 PM; Thursdays, 10:00 11:00 AM Hint: If door open, do not wait outside until current student is finished. TA office hours 1 Posted on the Portal 2 A ton of extra office hours around tests & exams The Economics Study Centre (Gluskin 110) Staffed by upper-year peer mentors Self-organized study groups Piazza Gazzale (University of Toronto) ECO101: Introduction 16 / 38

Syllabus Organization Moving forward Monday, 11-Sep Lecture. Read chapters 1 and 9 beforehand. Tutorial signup starts at 8PM. Wednesday, 13-Sep Lecture. Read chapters 2, 2a and first half of 8. Thursday: Portal Quiz 1 posted. Friday, 15-Sep Lecture. No new reading. Monday, 18-Sep Portal Quiz 1 available until 10:45am. Lecture. Read chapters 3 and 3a. Tuesday, 19-Sep Complete MobLab survey by 10:30am. Tutorials start. Wednesday, 21-Sep Lecture. No new reading. Thursday: Portal Quiz 2 posted. Monday, 25-Sep Portal Quiz 2 available until 10:45am. Lecture. Read chapters 6 and 6a. Gazzale (University of Toronto) ECO101: Introduction 17 / 38

P.S. Syllabus Organization Trust me, this course is more difficult than the High School economics course you took Gazzale (University of Toronto) ECO101: Introduction 18 / 38

A roundabout way towards defining economics Observation 1: Scarcity implies trade-off Scarcity: when a resource is limited so that all demands for it cannot be satisfied Gazzale (University of Toronto) ECO101: Introduction 19 / 38

A thought experiment Think about the movie you would most like to see My hypothetical offer: I will arrange for you to see this movie for free at a really nice and really convenient movie theatre, tonight, 8 PM. (I ll even pay for the Uber. Both ways.) Tonight at 8PM is only option. On the count of 3, raise your hand if you would not accept my offer. Gazzale (University of Toronto) ECO101: Introduction 20 / 38

Key concept I: opportunity cost Key concept I: opportunity cost Scarcity implies trade-offs! Opportunity cost Definition The value (often expressed in dollars) of the alternative foregone when using a resource Key Question What did I have to give up? (Sometimes called the next-best alternative. ) Opportunity cost in the large Policy evaluation. E.g., increased spending on the environment Key question: What would we have done with this money had we not spent it on the environment? Opportunity cost = the value of this alternative use Opportunity cost & the individual Example: The effect of in vitro fertilization on women s investment in advanced degrees Gazzale (University of Toronto) ECO101: Introduction 21 / 38

Key concept I: opportunity cost A Silly Question Assume you can purchase any album for $10 You have $20 (and only $20) to spend at itunes You are considering: John Coltrane s Giant Steps, which you value at $14 Charlie Parker s Yardbird Suite, which you value at $16 Miles Davis Birth of the Cool... Silly Question: You will purchase Birth of the Cool only if your value for it is at least how many dollars? Gazzale (University of Toronto) ECO101: Introduction 22 / 38

Key concept I: opportunity cost Key concept I: opportunity cost Example I: Birth of the Cool for sale at $10 What is the opportunity cost of acquiring Birth of the Cool? Key Question: What did you have to give up in order to acquire it? Gazzale (University of Toronto) ECO101: Introduction 23 / 38

Key concept I: opportunity cost Example II: Movie: $16.00 plus 3 hours of your life Key concept I: opportunity cost Because you use the $16 to go to the movie, you have to give up $16 worth of other consumption (or savings). You figure out the least painful way to reduce by $16... Assume you buy 8 fewer $2 coffees. Give me a dollar value (value to you, not price) of this foregone consumption/savings... Because you use this 3 hours to go to the movie, you have to give up 3 hours of time spent on something else. Assume you reduce time hanging out with friends by 3 hours Give me a dollar value of this foregone opportunity... Gazzale (University of Toronto) ECO101: Introduction 24 / 38

Positive vs. normative analysis Assessing tradeoffs Assessing tradeoffs Normative prescriptive (value judgement, ought or should ) Positive descriptive (theoretically verifiable; is ) Gazzale (University of Toronto) ECO101: Introduction 25 / 38

Assessing tradeoffs Economic models What we are going to do in ECO101 Simplify to make complex phenomena tractable Translation: we have to leave out (a lot of) details The big question: Does the model make accurate predictions? If no, revisit assumptions. Did we leave out qualitatively important details? Qualitative vs. quantitative predictions Assumed quantitative skills for ECO101 Basic algebra, solving systems of equations Graphing points and lines Deriving and manipulating equations of lines Calculating geometric areas Review: Chapter 2 Appendix Returning to the whole assumption thing... Gazzale (University of Toronto) ECO101: Introduction 26 / 38

The behavioural assumption in economics Cost-benefit principle The behavioural rule (i.e., The Cost-Benefit Principle) Given information, if the benefit of doing something is greater than (or equal to) the cost, do it. Implications/Assumptions People maximize well being. Firms maximize profits. People (firms) are willing and able do this cost-benefit analysis Strong version of assumption: Self-interested behaviour... Gazzale (University of Toronto) ECO101: Introduction 27 / 38

The behavioural assumption and the consumer Yes/No decision: Buy if Benefit (Opportunity) Cost Gazzale (University of Toronto) ECO101: Introduction 28 / 38

The behavioural assumption in action Example: Movie: $16.00 plus 3 hours of your life 1 Assume value of movie (to you, in dollars) known with certainty (value=how much you enjoy the movie) 2 What is the minimum movie value at which you (rationally) go to the movie? 3 ALL of the following increase the cost of going to the movie, and thus increase how much enjoyment you must get from the movie to make going rational A) An increase in the ticket price. B) An increase in the value of what you would otherwise do with the $16. C) An increase in the value of what you would otherwise do with the 3 hours. Gazzale (University of Toronto) ECO101: Introduction 29 / 38

Thinking like an economist II How many cups of coffee will B buy? What you know: If only offered the opportunity to buy 2 cups of coffee, the most B is willing to pay for these 2 cups is $5 (WTP(2) = $5) In fact, B can purchase as many cups of coffee as she wants at $2 per cup (P = $2) The question: True, False or Uncertain: If P = $2, B purchase at least 2 cups of coffee. Gazzale (University of Toronto) ECO101: Introduction 30 / 38

Key concept II: thinking at the margin Key concept II: thinking at the margin A tale of 2 B s Gazzale (University of Toronto) ECO101: Introduction 31 / 38

Key concept II: thinking at the margin Thinking like an economist II How much thinking at the margin Thinking at the margin Consideration of the benefits/costs of doing marginally more (e.g., one more) or marginally less (e.g., one less) of an activity Behavioural rule, restated Keep doing something as long as the marginal benefit (to me) are at least as large as the marginal cost (to me) the result If marginal benefits are not increasing and marginal costs are not decreasing, then following this behavioural rule maximizes net benefit (total benefit minus total cost) Gazzale (University of Toronto) ECO101: Introduction 32 / 38

Thinking like an economist IIa Thinking at the margin ignore sunk costs Key concept II: thinking at the margin Sunk costs are costs which cannot be avoided regardless of any action taken Costs already paid and non-refundable Costs you are obligated to pay in the future Gazzale (University of Toronto) ECO101: Introduction 33 / 38

Key concept II: thinking at the margin Key concept II: thinking at the margin Summer 2013 Exam; TFU = True, False or Uncertain Assume rationality as defined by an economist. You have already spent millions on a project. If you cancel the project, you incur no more costs and no benefits. If you continue, it costs you an additional $50 million to finish the project. Once finished, you receive $100 million with certainty. TFU: If you have already spent $10 million, you should continue the project, but if you have already spent $90 million, you should cancel the project. Gazzale (University of Toronto) ECO101: Introduction 34 / 38

Key Concept III: People Respond to Incentives Key concept III: people respond to incentives The implication of our behavioural rule Will get more of an activity if Increase its benefits Decrease its (opportunity) costs Decrease the explicit/direct cost Decrease the benefit of next best alternative Increase the explicit/direct cost of the next best alternative Will get less of an activity if... Gazzale (University of Toronto) ECO101: Introduction 35 / 38

Key Concept III: People Respond to Incentives Key concept III: people respond to incentives Beware of the Law of Unintended Consequences Texting while driving (TWD) = bad Clearly : Make it illegal = costs less TWD 2010 Study: U.S. Highway Loss Data Institute 3 out of 4 states: texting-related crashes after law introduction relative to states not passing law Potentially plausible explanation... Gazzale (University of Toronto) ECO101: Introduction 36 / 38

Summary Putting it all together Economics the study of how agents" make decisions on the allocation of scarce resources Microeconomics: the study of how individuals, households, and firms make decisions and interact in markets Macroeconomics: the study of economy-wide phenomena, including inflation, unemployment, and economic growth Economic models our main tool starring Homo Economicus Gazzale (University of Toronto) ECO101: Introduction 37 / 38

Summary An Economic Naturalist How do we explain increased college enrolments in the midst of the worst economic downturn in the last 70+ years? Hint: Tuition has not been falling... Gazzale (University of Toronto) ECO101: Introduction 38 / 38