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How does cooperation evolve over time? If you play the same game over and over again, how do you choose strategies where you reap the benefits of cooperation without being exploited. For example if someone always tries to cooperate, they loose poorly to someone who is always being selfish. We will contrast various types of repeated strategies but the one that tends to rise to the top is called Tit-For-Tat, where if someone is selfish back to you then you are selfish right back, and if they cooperate with you, you cooperate with them. Robert Axelrod introduced the idea of Iterated Prisoner's Dilemma tournaments where lots of people submit strategies and then the computer plays them all and this is where tit for tat rose up to the top. We will also think about repeated games like this from an evolutionary perspective and see how more cooperative strategies can become more popular over time, leading to the evolutionary origin of cooperation.

0:00 Intro
0:42 The Prisoner's Dilemma
3:21 Iterated Game Strategies
5:20 Prober Strategy
6:35 Grudge Strategy
7:54 Tit for Tat Strategy
10:44 Properties of Successful Strategies
13:49 Evolution against Randoms
15:25 Evolution of Cooperation
18:23 www.brilliant.org/treforbazett


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