Slides for October 11 Microeconomics Lecture
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Transcript of Slides for October 11 Microeconomics Lecture
Economics 1: Fall 2010
J. Bradford DeLong, Michael Urbancic, and a cast of thousands...
hAp://delong.typepad.com/econ_1_fall_2010/
Ladies and Gentlemen, to Your i>Clickers...
• About how much does use of markets rather than command amplify societal economic producMvity? – A. None – B. Doubles it – C. Triples it – D. Quadruples it – E. Quintuples it
Administrivia: The Next Month: The Long March to the Second Midterm
• M Oct 11: Choice, Scarcity, and Exchange
• W Oct 13: Markets and Other AllocaMon Procedures. Essay 2: two-‐pages on human social large-‐scale cooperaMon
• M Oct 18: Working with Supply and Demand
• W Oct 20: ProducMon and Equilibrium in the Short Run and the Long Run. Problem set 4
• M Oct 25: General Equilibrium and the "Efficiency" of "Perfect" CompeMMon.
• W Oct 27: Monopoly. Problem set 5 • M Nov 1: Oligopoly • W Nov 3: MonopolisMc CompeMMon.
Problem set 6 • M Nov 8: MIDTERM 2 EXAM
Economics 1: Fall 2010: Choice, Scarcity, and Exchange
J. Bradford DeLong
October 11, 2010, 12-‐1 Wheeler Auditorium, U.C. Berkeley
Guessing at Some Numbers • Growth rates of populaMon
– HG: 0.01%/year – AS: 0.05%/year – EM: 0.2%/year – >1800: 1.0%/year
• Growth rates of technological and organizaMonal knowledge – HG: ???? – AS: 0.01%/year – EM: 0.09%/year – IS: 2%/year
• Growth rates of global GDP – AS: 0.05%/year – EM: 0.2%/year – EIS: 1.4%/year – IS: 3.4%/year
How Much Does Market OrganizaMon MaAer?
• We have a 20th century “natural experiment”
• High Stalinist central planning – Marx’s suspicion of markets as
surplus-‐extracMon devices – Hence, the communists said, we
won’t have any – We will reproduce the Rathenau-‐
Ludendorff World War I Imperial German war economy
– Communes, economies of scale, GOSPLAN, etc.
• Effect: you throw away a five-‐ to ten-‐fold amplificaMon of producMvity by eschewing the market – Effect on human welfare can be
greater or smaller
Effect on Human Welfare Can Be Greater or Lesser
• Lesser: – In Cuba life expectancy is high – In Cuba inequality is low
• Greater:
The Economic Problem • Stuff:
– What... – How... – For whom...
• We can’t make everything • Where there is no scarcity—or
where we don’t care that there is scarcity—there is no economic problem
• Where there is, and where we care, there is an economic problem: – Ursula K. LeGuin: Urras and
Anarres – Jan Wenner vs. Paul Allen
What Do We Care About?
• We care about choices between things we value
• “Opportunity cost” – What is the “opportunity cost” of aAending Cal? • Cash cost plus foregone wages plus foregone valuable experience plus Med to Berkeley plus not a boring job...
– What is the “opportunity cost” of drinking a cup of coffee? • You can’t spend the Mme and money taking yoga lessons
Scarcity and Choice in a MulM-‐Person Economy
• Dharma and Greg – Greg is good at making coffee—can make, say, 10 cups a day • But inept at yoga—one lesson a day max
– Dharma is good at doing (and teaching) yoga—can teach 5 lessons a day • But can only make two cups of coffee
What the Market System Gets Us • Win-‐win
– Dharma benefits as long as the price of yoga lessons > cu0.40
– Greg benefits as long as the price of yoga lessons < cu10
• Wealth MaximizaMon – Any price between cu0.40 and cu10
produces an “wealth-‐maximizing producMon outcome
– Any price between cu0.40 and cu10 produces an efficient allocaMve outcome
– Any price outside the range shuts the market—and specializaMon—down
• DistribuMon: – A price of cu10 gives all the surplus to
Dharma – A price of cu0.40 gives all the surplus to
Greg – A price of cu2 makes them equally well
off • Or does it?
Ladies and Gentlemen, to Your i>Clickers...
• The “economic problem”: – A. Is figuring out how to deal with the fact of scarcity in (at least some of) the things we care about.
– B. Is the result of high opportunity costs. – C. Was solved for all Mme by the wave of technological innovaMon that was the Industrial RevoluMon.
– D. Is that supply is not guaranteed to match demand. – E. Is that of figuring out what prices should be charged in markets
In Order to Coordinate...
• ...in an economy with N commodiMes via the market, you have to... – 1. Find a whiteboard – 2. Write down N prices
– 3. Laissez-‐faire – 4. Maybe you don’t have to write down the prices
In Order to Coordinate...
• ...in an economy with N commodiMes via a bureaucraMc command-‐and-‐control hierarchy, you have to... – 1. Tell everybody what to do
– 2. Tell everybody what they are going to consume
– 3. Check up to make sure everybody is doing what they are supposed to be doing
How Important Are These InformaMonal Differences?
• With two people—Dharma and Greg—these informaMon differences may not seem that important
• But with 140 million workers and with 100,000 different commodiMes?
• What if it is more producMve to do pieces of the division of labor via bureaucraMc command-‐and-‐control? – Then the market provides
incenMves to create such islands within itself—that is what big businesses are
QuesMons to Ask of Any Societal CalculaMng Mechanism
• Is it aAainable? – i.e., China during the Great Leap Forward
not aAainable
• Will the right people be making the right things?
• Will anybody say “I don’t want that, I want this instead”?
• Will it be fair? – The cu0.40 price allocaMon might be
Pareto-‐opMmal • Dharma teaches yoga • Dharma consumes 2.5 yoga and 1 cup of
coffee—and at a price of cu0.4 doesn’t want to teach any more or less for any more or less coffee
• Greg consumes 2.5 yoga and 9 cups of coffee—if he doesn’t like yoga that much, he might not want to take any more yoga lessons even at a price of cu0.4
– But it doesn’t seem fair, does it? • That is what we will look at next
Mme...
Ladies and Gentlemen, to Your i>Clickers...
• What is the single principal reason to have a market economy rather than a bureaucraMc-‐command economy? – A. It is more producMve – B. It requires that a huge amount less of effort be spent on centrally collecMng and processing informaMon
– C. It requires that a huge amount less of effort be spent checking up on people to make sure that they are doing what they are supposed to be doing
– D. Its tolerance of independent centers of social power makes a collapse into oppressive dictatorship less likely.
– E. It is fairer
Test Your Knowledge
• What is the “economic problem”? • What is “opportunity cost”? • What informaMon do we need to disseminate in order for a market economy to funcMon?
• What informaMon do we need to acquire and process in order for a centrally-‐planned bureaucraMc economy to funcMon?
• What are the quesMons we should ask of any societal social calculaMng mechanism?