[AlexM]

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I'm a capitalist, but I don't read the chart in quite the same way others here are. I see that more people stay in their quintile group than move to any other group. And that this is most pronounced for the poorest and richest quintiles.

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Over a very tiny section of time...

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Do you have data suggesting it is different over a larger amount of time? I'm curious.

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The data given shows it. If it's 50% over 20 years it's gonna be like 25% over 40 years. This is pretty simple. Admittedly, I'm way over simplifying it, but it's certainly going to keep on going.