The chart of income vs percent who commute by bike is u-shaped but with a higher left side. Rich people bike more than middle class people but poor people bike more than either the rich or middle class. People who are on the right half of the distribution think biking is affluent-coded because they only see the right tail where it curves up and they don't know anyone on the left side of the distribution where the gradient goes the other way.
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The chart of income vs percent who commute by bike is u-shaped but with a higher left side. Rich people bike more than middle class people but poor people bike more than either the rich or middle class. People who are on the right half of the distribution think biking is affluent-coded because they only see the right tail where it curves up and they don't know anyone on the left side of the distribution where the gradient goes the other way.