Outline
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Culture:
Ramblings on Ketchup, Dagen H, Condensed
Matter Physicists, Efficiency and Diversity
Scott E Page
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Outline
• Culture: what is it?• Culture: why we care?• Game Theory Model of Culture as Coordination• Bednar Page: GameS theory Model• The Model of our model as told to physicists• Our version of the model of our model• Culture in the laboratory• ABM culture
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Culture: What is it?
• Behavior• Beliefs• Roles• Categories• Values• Symbols• Artifacts• Networks
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Culture: Why We Care
Our ability to improve our lot and the lot of others depends on an understanding of culture. The performance of institutions from markets writ large to water rights systems to educational reforms hinges on culture. Knowing how people answer the question “do you trust other people?” is as informative in predicting per capita GDP as is average level of education.
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Do I know Anything About Culture?
No!
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Larger Project
Culture Institutions
Bednar and Page (2007) “Can Game(s) Theory Explain Culture? The Emergence of Cultural Behavior Within Multiple Game” Rationality and Society
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Larger Project
Culture Institutions
Bednar and Page (2007) “Can Game(s) Theory Explain Culture? The Emergence of Cultural Behavior Within Multiple Game” Rationality and Society
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Start Simple
Game Theory ModelAxelrod ModelBednar Page ModelModel of Bednar Page Model
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Suppose you could ask people one question
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Where do you keep your ketchup?
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A.Fridge
B.Cupboard
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No!
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Coordination
Formally, these are called games of coordination. People benefit by coordinating with others more than they benefit by doing what they want.
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Subtle Difference
In the standing ovation model, we discussed to reasons why people might copy others:
- social influence- information
How does coordination differ from influence?
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Dagen H
At 4:45 am on September 3, 1967, all cars on the road in Sweden came to a stop. They switched sides (from the left to the right) and at 5 am, the cars began moving again.
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Coordination Examples
Choice of LanguageTime Classes StartMeeting PlaceElectric Plugs
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Hard and Soft Externalities
An externality is hard (economic) f it’s easily measured
An externality is soft (psychological) if it’s not.
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No Bright Line
Some decisions involve both hard and soft coordination externalities. Suppose I’m buying a bike. The more people that buy mountain bikes, the more trails that get created (hard). Buying a mountain bike might also make me hip (soft).
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Anecdote
Once, I was riding in a cab to the New Orleans airport. I told the driver I was in a hurry and he began to run through stop signs. At first, I was scared. Then, I realized he was only running East-West stop signs.
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Basic Coordination Game
1,1 0,0
0,0 1,1
EW NS EW NS
Cab #1
Cab #2
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Cultural Efficiency
You and a friend are told that you’ve won a free trip for spring break provided that you both choose the same location from a list of two. If you do pick the same location, you get to go there for an all expenses paid week of fun.
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Maui- Des Moines Game
10,10
0,0
0,0 1,1
Maui DM Maui
You
Friend
DM
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Shake or Bow?
We could great people in a variety of ways. In the West, people tend to shake hands. In the East People tend to bow.
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Shake or Bow Game
a,a 0,0
0,0 1,1
Shake Bow Shake
You
Friend
Bow
Is a <> 1
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The CDC Opinion
Getting off from an airplane and shaking hands (or worse yet hugging or kissing) is akin to saying “here take all of these diverse germs and viruses I’ve accumulated after three hours in a sealed container with a bunch of strangers.”
a < 1
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Inefficient Coordination
Beta vs VHSMac vs IBMEnglish vs MetricFruit Cake vs iStore
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Lots of Ketchup
We’ve focused so far on how coordination can lead us to arbitrary behaviors and sometimes inefficient behaviors.
It also can explain cultural differences.
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A List of Questions
Ketchup in the fridge?Do people wear shoes inside your house?Do you cross the street when the don’t walk sign
is flashing?Read the newspaper at the breakfast table?Do you hug your friends when you see them?Individual Napkins?
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A List of Questions
Ketchup in the fridge? YesDo people wear shoes inside your house? NoDo you cross the street when the don’t walk sign is
flashing? YesRead the newspaper at the breakfast table? YesDo you hug your friends when you see them? YesIndividual Napkins? Yes
You’re part of YNYYY Nation
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How Many Cultures?
Six questionsTwo answers each
2 x 2 x 2 x 2 x 2 x 2 = 64
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The Set of The Possible
Dead People: bury or burnFoods do you eat?Dress?Music do you playStories do you tell
8 x 19 x 40 x 6 x 11 x 23 x 2 x 43 .. = HUGE
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Axelrod’s Culture Model
People play many cocrdination games with neighbors
If two neighbors don’t coordinate in many games, they stop playing with each other
Result: Emergence of distinct cultures
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Bednar Page Model
Agents play game ensembles with a community of agents.
Each agent has only one brain (automata)Agents evolve “similar” strategies across
games
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World vs Models
Coordination and Axelord Models: Inter cultural differences but intra cultural heterogeneity (all Irish the same)
Bednar Page Model and World: Heterogeneity within and across cultures.
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Jenna’s Question
“Suppose people play many coordination games and that in addition to trying to coordinate with other people they also want to be consistent across the games. For example, suppose each game has a hot action (1) and a cold action (0). What happens?”
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Scott’s Response
“Clearly, the community will just converge to everyone being hot or everyone being cold and it should happen fast. I’ll tell you after lunch.”
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Scott’s Question to Len
“Suppose people play many coordination games and that in addition to trying to coordinate with other people they also want to be consistent across the games. For example, suppose each game has a hot action (1) and a cold action (0). What happens?”
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Len’s Response
“Oh, like a coupled voter model. Neat question. Clearly, the community will just converge to everyone being hot or everyone being cold and it should happen fast. I’ll tell you after lunch.”
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Len’s Question to Casey
“Suppose people play many coordination games and that in addition to trying to coordinate with other people they also want to be consistent across the games. For example, suppose each game has a hot action (1) and a cold action (0). What happens?”
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Casey’s Response
“The time for both conformity and consistency (what we call exit time) is much longer than for either process alone.”
Conformity and Dissonance in Generalized Voter Models” - Scott E Page, Leonard M. Sander, and Casey Schneider - Mizell
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Cultural Emergence in Game Ensembles: An Experimental Study
Jenna Bednar, Yan Chen, Xiao Liu and Scott Page
University of Michigan - Ann Arbor
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This Paper
Does “culture” emerge in the laboratory by having subjects play
multiple games?
Behavioral Spillover = Institutional Externality
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Standard Experiment
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7,7 2,10
10,2 4,4
D
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Our Experiments
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7,7 2,10
10,2 4,4
7,7 4,14
14,4 5,5
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Our Games
7,7 2,10
10,2 4,4
7,7 4,14
14,4 5,5
7,7 2,9
9,2 10,10
7,7 4,11
11,4 5,5
Strong ALT PD
Weak ALT Self Interest
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Experimental Design
Controls: WA, SA, PD, SI
Pairs: WA + SA, WA +SI, WA + PD
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Hypothesis 1
% of CC in WA higher in WA+PD, than in WA
% alternation in WA higher in WA than in WA+PD
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Hypothesis 2
% alternation in WA higher in WA than in WA+SI
% CC,DD in WA higher in WA+SI than in WA
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Hypothesis 3
% alternation in WA higher in WA+SA than in WA
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Hypothesis 4
% Efficient outcomes in SI, PD, and SA lower when paired with WA.
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Hypothesis 1
% of CC in WA higher in WA+PD, than in WA
% alternation in WA higher in WA than in WA+PD
WA: 33%alternateWA+PD: None alternate, one pair
cooperates
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Hypothesis 2
% alternation in WA higher in WA than in WA+SI
% CC,DD in WA higher in WA+SI than in WA
WA + SI: 33% alternate, 33% play DD
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Hypothesis 3
% alternation in WA higher in WA+SA than in WA
WA: 33% full alternation, more attempts at alternation
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Hypothesis 4
% Efficient outcomes in SI, PD, and SA lower when paired with WA
PD: Less cooperationSA: Less alternationSI: No effect
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Experimental Summary
Experiments fit mathematical and computational theory
Strong behavioral spillovers/institutional externalities
GameS experiments differ from game experiments
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ABM Culture
You’ve heard talks about artificial life and will hear more talks about agent based models. These provide an incredible laboratory in which to investigate the emergence of culture and its implications.