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Economics 2: Spring 2014 J. Bradford DeLong ; Maria Constanza Ballesteros ; Connie Min http://delong.typepad.com/sdj/econ-2-spring-2014/

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Economics 2: Spring 2014: Scarcity and Choice http://delong.typepad.com/sdj/econ-1-spring-2012/ January 27, 2014, 4-5:30 101 Barker, U.C. Berkeley

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How Much Does Market Organization Matter? We have a 20 th century “natural experiment” High Stalinist central planning – Marx’s suspicion of markets as surplus-extraction 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- fold amplification of productivity by eschewing the market

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What Do We Care About? We care about choices between things we value “Opportunity cost” – What is the “opportunity cost” of attending Cal? Cash cost plus foregone wages plus foregone valuable experience plus tied to Berkeley plus not a boring job... – What is the “opportunity cost” of drinking a cup of coffee? You can’t spend the time and money taking yoga lessons

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Ten People Who Do Nothing But Drink Espresso and Give (or Take) Individual Yoga Lessons… Yoga Teachers – Black Widow (25) – Tyrion Lannister (15) – Captain America (10) – Hannah Horvath (5) – Arnold Schwarzenegger (0) Yoga Students – WyldStyle (20) – Beyoncé (16) – Macklemore (12) – Adam Sackler (8) – Jerry Brown (4)

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Concept of a “Reservation Price” For sellers, the price below which you think you got a really bad deal if you sell—you really, after thinking about it, would rather not have sold at all… For buyers, the price above which you think you got a really bad deal—you really, after thinking about it, would rather not have bought at all…

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Ways of Organizing Yoga Lessons Bureaucratic command-and-control – Some bureaucrat decides how many lessons to offer – Some bureaucrat picks suppliers – Some bureaucrat picks clients Thick-tie reciprocity – Along social networks Market

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Bureaucratic Command and Control Pick a random number from 0-5:

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Bureaucratic Command and Control Pick a random number from 0- 5: 2

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Bureaucratic Command and Control Pick a random number from 0- 5: 2 Pick two teachers:

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Bureaucratic Command and Control Pick a random number from 0- 5: 2 Pick two teachers:

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Bureaucratic Command and Control Pick a random number from 0- 5: 2 Pick two teachers: Tyrion Lannister and Arnold Schwarzenegger

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Bureaucratic Command and Control Pick a random number from 0- 5: 2 Pick two teachers: Tyrion Lannister and Arnold Schwarzenegger Pick two students

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Bureaucratic Command and Control Pick a random number from 0-5: 2 Pick two teachers: Tyrion Lannister and Arnold Schwarzenegger Pick two students: Macklemore and Adam Sackler

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Bureaucratic Command and Control Pick a random number from 0-5: 2 Pick two teachers: Tyrion Lannister and Arnold Schwarzenegger Pick two students: Macklemore and Adam Sackler What’s the outcome? – Macklemore happy (+12), Adam happy (+8) – Tyrion annoyed (-15), Arnold meh (0)

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Bureaucratic Command and Control Pick a random number from 0-5: 2 Pick two teachers: Tyrion Lannister and Arnold Schwarzenegger Pick two students: Macklemore and Adam Sackler What’s the outcome? – Macklemore happy (+12), Adam happy (+8) – Tyrion annoyed (-15), Arnold meh (0) Net hedonic calculus: +4

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“Thick Tie” Social Network Reciprocity How many students are there with thick ties to and owed favors by teachers? At random…

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“Thick Tie” Social Network Reciprocity How many students are there with thick ties to and owed favors by teachers? At random… – Black Widow owes Beyoncé a favor… – Hannah Horvath owes WyldStyle a favor…

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“Thick Tie” Social Network Reciprocity How many students are there with thick ties to and owed favors by teachers? At random… – Black Widow (-25) owes Beyoncé (+16) a favor… – Hannah Horvath (-5) owes WyldStyle (+20) a favor…

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“Thick Tie” Social Network Reciprocity How many students are there with thick ties to and owed favors by teachers? At random… – Black Widow (-25) owes Beyoncé (+16) a favor… – Hannah Horvath (- 5) owes WyldStyle (+20) a favor… Net hedonic calculus: + 6

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Notice the Pairings… Bureaucracy – Adam-Arnold (+8) – Macklemore-Tyrion (-3) – Where are Beyoncé and WyldStyle? Reciprocity – Black Widow-Beyoncé (-9) – Hannah Horvath-Wyldstyle (+15) – Where is Arnold?

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Is There a System? That would avoid the defects of: – Bureaucracy Adam-Arnold (+8) Macklemore-Tyrion (-3) Where are Beyoncé and WyldStyle? – Reciprocity Black Widow-Beyoncé (-9) Hannah Horvath-Wyldstyle (+15) Where is Arnold? And get the right people teaching and the right people taking yoga lessons?

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There Is: A Competitive Market At a price of 21: 4 teachers (everyone except Black Widow), 0 students: excess supply of 4…

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There Is: A Competitive Market At a price of 21: 4 teachers (everyone except Black Widow), 0 students: excess supply of 4… At a price of 1: 1 teacher (Arnold), 5 students: excess demand of 4…

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There Is: A Competitive Market At a price of 21: 4 teachers (everyone except Black Widow), 0 students: excess supply of 4… At a price of 1: 1 teacher (Arnold), 5 students: excess demand of 4… At a price of 16: 4 teachers (everyone except Black Widow), 1 student (WyldStyle): excess supply of 3…

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There Is: A Competitive Market At a price of 21: 4 teachers (everyone except Black Widow), 0 students: excess supply of 4… At a price of 1: 1 teacher (Arnold), 5 students: excess demand of 4… At a price of 16: 4 teachers (everyone except Black Widow), 1 student (WyldStyle): excess supply of 3… At a price of 6: 2 teachers (Hannah and Arnold), 4 students (everyone except Jerry Brown): excess demand of 2…

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There Is: A Competitive Market At a price of 21: 4 teachers (everyone except Black Widow), 0 students: excess supply of 4… At a price of 1: 1 teacher (Arnold), 5 students: excess demand of 4… At a price of 16: 4 teachers (everyone except Black Widow), 1 student (WyldStyle): excess supply of 3… At a price of 6: 2 teachers (Hannah and Arnold), 4 students (everyone except Jerry Brown): excess demand of 2… At a price of 11: 3 teachers (Hannah, Arnold, and Captain America), 3 students (WyldStyle, Beyoncé, and Macklemore): excess demand and excess supply of 0!

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There Is: A Competitive Market Tatonnement: – At a price of 21: 4 teachers (everyone except Black Widow), 0 students: excess supply of 4… – At a price of 1: 1 teacher (Arnold), 5 students: excess demand of 4… – At a price of 16: 4 teachers (everyone except Black Widow), 1 student (WyldStyle): excess supply of 3… – At a price of 6: 2 teachers (Hannah and Arnold), 4 students (everyone except Jerry Brown): excess demand of 2… – At a price of 11: 3 teachers (Hannah (-5), Arnold (0), and Captain America(-10)), 3 students (WyldStyle (20), Beyoncé (16), and Macklemore (12)): excess demand and excess supply of 0! Net hedonic calculus: +33

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Properties of a Competitive Market Everyone teaching has a reservation price lower than the market equilibrium price. Everyone taking lessons has a reservation price higher than the MEP. Every teacher with a reservation price lower than the MEP is teaching. Every student with a reservation price higher than the MEP is taking lessons. A higher price would have someone teaching someone with a lower reservation price than they have. A lower price would leave a deal to be made—a potential student would be left with a higher reservation price than a potential teacher.

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Properties of a Competitive Market It does the very best we can do… It (almost) enforces itself… WyldStyle and Arnold think it’s great! Captain America and Macklemore think it’s nothing special Black Widow, Tyrion Lannister, Adam Sackler, and Jerry Brown don’t understand the excitement

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Supply and Demand Chapter 3 Copyright © 2010 by the McGraw-Hill Companies, Inc. All rights reserved. McGraw-Hill/Irwin.

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