Religion and income distribution. Not sure I get exactly what data they used to get this, but still kind of interesting. Incomes seem to skew upward the smaller the group, which makes a certain amount of sense.
The Hindu numbers surprised me a bit. I was guessing that has something to do with the high percentage of Indians in tech/healthcare professions, presumably making $100k+.
Things to ponder on a Sunday
graph paper diaries 
Additional, from Red State, Blue State: In the South churchgoers tend to be drawn more from the upper classes. In the North from the lower. It's not stark but it's pretty solid, I recall.
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And I thought Buddhists weren't attached to wealth and possessions. Or something.
History and socio-economic status explain a lot.
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