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Well, there's all sorts of reasons
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and this is going to come out in the context of social psychology
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when we talk about how people think about human groups.
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But one quick answer is
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people who are plainly Jewish are prominent
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in positions where people notice them, like entertainment or,
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in the case of you guys, academia.
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And this could lead to--this availability--
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"Can I think of a Jew? Yeah."
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This availability causes us to overestimate
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the proportion to which Jews are represented in the population.
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Final example. Confirmation bias.