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Outcome Bias
Imagine you want to learn how to play blackjack, and you have the chance to choose your teacher from one of three players. After watching them play several hands, player 1 has won £100, player 2 has won £50 and player 3 has lost £100. If you asked player one to teach you how to play because they won the most money, then you are falling prey to Outcome Bias. Did they win the most money because they made the best decisions? Or did they win the most money despite the poor quality of their decisions?
