at george mason universityelearningsymposium.gmu.edu/2007/presentations/mccabe - using second... ·...
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“Teaching Economics in Second Life”
Kevin A. McCabe*, Stephen Saletta, Gavin EkinsProfessor of Economics, Law, and NeuroscienceGeorge Mason [email protected]
CSNTHE CENTER FOR THE STUDY OF
NEUROECONOMICSAT GEORGE MASON UNIVERSITY
CSN Why Second Life?
• Second Life is Creating Wealth – Adam Smith– Server space (land), virtual meeting space,
programming and graphics (goods and services)
• There is a circular flow of both money (lindens) and goods and services– How much is difficult to determine without
appropriate macro accounting data.– But all the micro data is there at the transaction level
and this could in principal lead to novel practices and an interesting study of the micro-foundations of macro.
CSN Why Second Life?
CSN Why Second Life? (continued)
• Second Life has many of the same concerns as any other state– How to manage the money supply.– How to attract capital and keep it in the economy.– How to maintain an import/export balance.– How to provide public goods and services.
• Second life can be explored on your desktop– The economy comes to you.
CSN Why Second Life (continued)
• It’s the Wild-Wild West – Problems, but also opportunities.– What should rule of law look like in Second Life?– How should governance structures work in second
life? Identity, Reputation, and Taxes.– Is Linden Labs a benevolent dictator? Or are they a
real life firm with profit making motives? From the viewpoint of economics do we treat them as a force of nature, the government, or as a service firm in First Life that operates Second Life for their own purpose?
CSN Our Strategy for Second Life
• Buy an Island – Terraeconomicus (150, 85, 57) • Learn how to write scripts, add content, and run
some experiments.
CSN Our Strategy for Second Life
• Buy an Island – Terraeconomicus (150, 85, 57) • Learn how to write scripts, add content, and run some
experiments.• Build a Second Life Learning Laboratory in
First Life (tried once – no success yet)• Design and deliver a programming course in Second
Life. (Build Human Capital)• Design and deliver a content driven economics course
with demonstration experiments in Second Life. (Standard Course Approach)
• Turn Terraeconomicus into a distance learning experience with classes meeting on the island and students able to get GMU credit for study on the island.
CSNThe Bank of Sweden Prize in
Economic Sciences in Memory of Alfred Nobel 2002
"for having established laboratory experiments as a tool in empirical economic analysis…”
Vernon Smith
Allegra 3T Scanner
Top View
Front View
Behavioral Lab
CSN Krasnow LaboratoriesImaging Lab
CSN Inducing Subject Incentives
Buyer 1
Unit Value Price Earnings1 $92 $63 $3
Total Earnings:
Value indicate the dollar resale for each unit paidby the experimenter.
Price is the dollar amount the buyer pays the seller.
CSN Inducing Subject Incentives
Buyer 1
Unit Value Price Earnings1 $9 $4 $52 $6 $5 $13 $3
Total Earnings: $6
In this case the buyerwould be paid $6.
Earnings is the net dollar earnings of the subject.
CSN Inducing Subject Incentives
Seller 1
Unit Price Cost Earnings1 $12 $43 $7
Total Earnings:
Price is the dollar amount the buyer pays the seller.
Cost indicate the dollar price for each unit the sellerpays the experimenter.
CSN Inducing Subject Incentives
Seller 1
Unit Price Cost Earnings1 $4 $1 $32 $5 $4 $13 $7
Total Earnings: $4
In this case the sellerwould be paid $4.
Earnings is the net dollar earnings of the subject.
CSN Inducing Subject Incentives
Buyer 1
Unit Value Price Earnings1 $9 $4 $52 $6 $5 $13 $3
Total Earnings: $6
Seller 1
Unit Price Cost Earnings1 $4 $1 $32 $5 $4 $13 $7
Total Earnings: $4
The difference between the buyers value and the sellers cost isthe surplus from the trade. The experimenter pays the surplus.
CSN B1 and S1 on Supply and Demand
B1
B1
B1
S1
S1
S1
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lars
Units
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CSN
B1
B2
B3
B1
B2
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B1
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B3S1
S2
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S1
S2
S3
S1
S2
S3
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lars
Units
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Other Buyers and Sellers
CSN
B1
B2
B3
B1
B2
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B1
B2
B3S1
S2
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S3
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0 1 2 3 4 5 6 7 8 9 10
Dol
lars
Units
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Competitive Equilibrium
CSN The Double Auction Institution
(1) Message space: Bid, Ask, Buy, Sell.
(2) Message sending rules: Buyers Bid & Buy;Sellers Ask & Sell; Improvement Rule;Starting and Stopping rules.
(4) Production rules: Buy or Sell: results inBuyer sending Seller cash and Sellersending Buyer a unit.
(3) Message processing rules: Update book; Determine standing bid and ask.
CSN The Double Auction Book
ID Bid Ask ID
B2 $3
CSN The Improvement Rule
ID Bid Ask ID
B2 $3
$7 S3
$6 S1
Improvem
ent Rule
CSNID Bid Ask ID
B1 $3
$7 S3
$6 S1
Improvem
ent Rule
B1 $4
More Improvement
CSN The Bid-Ask Spread
ID Bid Ask ID
B1 $3
$7 S3
$6 S1
B1 $4
CSN Contract
ID Bid Ask ID
B1 $3
$7 S3
$6 S1
B1 $4
Sell S1
CSN Contract between B1 and S1
ID Bid Ask ID
B1 $3
$7 S3
$6 S1
B1 $4
Sell S1
CSNID Bid Ask ID
B1 $3
$7 S3
$6 S1
B1 $4
Sell S1
Price = $4
Contract between B1 and S1 at $4
CSN What we see in the real world
0 1 2 3 4 5
1
4
5
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Time
$
ID Bid Ask ID
B1 $3
$7 S3
$6 S1B1 $4
Sell S1
The Book (maybe) Contracts
CSN What the experimenter sees
Environment:(values/costs)
Messages
Outcomes(contracts)
Governance
Institution:DA
Feedback Production
ID BID ASK ID
B1 $3$7 S3
$6 S1B1 $4
Sell S1
S
D1 2 3 4 5
CSN What the experimenter can do
(1) Replicate an experiment by inducing the same values and costs and using the sameinstitution.
(2) See how changing the rules affects themessages that are sent.
(4) Measure performance such as economic efficiency.
(3) See how changing the value/costenvironment affects messages.
CSN Pilot education project
Center for Neuroeconomics, George Mason University
Cognitive Neuroscience Section, National Institute of Neurological Disorder and Stroke
1Lt, USAFR, Office of the Assistant Secretary of the Air Force (Acquisition Integration)
Steve Saletta
CSN Overview
Existing efforts in Second Life•Research
Conduct “macro-level” economics experiments
•EducationDeliver undergraduate level course content to students.
CSN Overview
Benefits to Research•All transactions/interactions take place through the computer
Minimizes error in recording
•Large Simultaneous User basePermits multi-subject experiments (20-30 people, real-time)
People will do anything for a buck (linden)
CSN Overview
Benefits to Education
•Rich 3-D environment
•“Experiential” learning
•Enables persistent individual lessons or simultaneous interactionwith students/instructor
CSNGoals
•Undergraduate (100 level) economics course taught 50% in second life, 50% in the classroom
•Develop “modules” supporting lessons to accompany lessons from traditional textbook
•Online evaluation of learningQuiz automatically emails responses to instructor
Hybrid traditional/online course
CSN Test Module
Goals
•Proof of concept module to explore/demonstrate capabilities
•Using in-house talent to baseline development costs
•Long term goal of attracting support for further development
CSN Steve Saletta
CSN Test module
Ice Cream Truck
•Students drive a truck through several neighborhoods
•Set price
•Receive feedback on quantity of cones sold
•Display’s the decisions of the student on a traditionaldemand curve
CSN Steve Saletta
CSN Steve Saletta
CSN Procurement
Our costs
•Approx. 80-100 hours from ground zero to limited functionality
•PhD Economics grad student programmers with VisualBasic/Java experience, but no graphic-design or 3-D modeling experience
Other approaches
•Contracting to other second life residents
Successfully used by NOAA
CSN Steve Saletta
CSN Challenges/Issues
•Need ongoing in-house talent or support contractor
•Relatively steep learning curve compared to traditionalweb-based content delivery mechanisms
•All IP/Content is stored on servers owned by Linden LabsDeveloped content cannot function in the absence of servers
CSN Gavin Ekins
Thank YouCSN