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Lecture 6

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Political Science
Nathalie Fournier

Week 7- Lecture 6 October-22-12 3:07 PM Non-Cooperative Games  Conflicting and competing preferences (sometimes zero games)  Prisoner's Dilemma  Chicken Prisoner's Dilemma  Tension between community choice and individual choice  Order of preferences  Look at 2 countries - nuclear o Best community choice- no nuclear proliferation o Individually- country goes nuclear and the other country doesn’t  DC>CC>DD> CD  Rank in numbers - DC (5)> CC(2)>DD(0)>CD(-2)  Cooperate- best outcome for both countries o Ex. Best response for India will be to defect if they know for sure Pakistan wouldn’t o Ex. If Pakistan is defecting then India should defect also o Therefor e likely outcome is defect for both countries - stable outcome and a dominate strategy Nash Equilibrium: a pair of strategies (an outcome) for which neither players gains by changing her own strategy  John F. Nash  Stable equilibrium,: actors will not change their policy unless they can agree to do so mutually and simultaneously The Evolution of Cooperation  Iterate games  Tit for tat- develops cooperation  The problem of finite games (backwards induction)  What institutional design can facilities tit for tat (neo-liberalism) Summary:  PD is used as a metaphor for many aspects of international relations - mainly as an explanation for the difficult to sustain cooperati
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