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Now let's talk about politics. If you have an echo chamber, and the reason the word is useful,

if it is, is that it helps clarify why group polarization occurs.

So if you're a group of people who tend to think, let's say that one presidential candidate is good,

and the other is not so good, and let's bracket the question whether they're right.

As they talk to each other, they'll hear lots of arguments in favor of the goodness of the

one they prefer, and not many in the other direction.

And as they talk to each other, they will become more extreme, not because there's anything

weird about them, but because they're hearing arguments in support of the conclusion to which they're drawn.

And that's how Echo Chambers were.

And now the Good Fight with Yasha Monk.

My guest today is Cass Sunstein.

Cass is the Robert Wormsley University professor at Harvard Law School.

He was also a senior political appointee in the Obama White House as the administrator of the Office of Information and Regulatory Affairs.

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