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Via Sociological Images (by way of the Economic Mobility Project) is an interesting chart showing downward class mobility among blacks and whites. Each bar represents the percentage of children who end up in the bottom fifth of income earners by race and income of the parent:

This week, we're going to take a step back from examining messages to your matches and take a look at matching itself. We'll slice OkCupid's data on compatibility by religion, race, and other factors, and by the end we'll have some unsettling conclusions on how people match and interact online. But first, I want to explain something important.