I haven't looked at the article yet. I'm guessing: Men are paid more, because they work in more dangerous areas, work longer hours, and are less often primarily responsible for caregiving.

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Ok, I read it, and pretty much nailed it, but the other factor is that men tend to drive faster, and so simply complete more rides in the same amount of time.

None of the factors explaining the 7% pay gap seem to have anything to do with (a) Uber or (b) Customers. It's all seems to be based on choices by the driver.