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Certainly, there's a bandwagon effect to this with TV shows.
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If everybody in America watches the same TV show,
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which apparently is American Idol these days,
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then you can also talk about it over lunch.
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Notice that's a really horrible place to coordinate.
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There are similar examples to the American Idol example.
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When I was growing up in England,
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again I'm going to reveal my age;
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everybody decided that to be an "In" Person in England,
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you had to wear flared trousers.
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This was and so to be in you had to wear flared trousers.
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This is a horrible coordination problem, right?