> It's not hugely difficult to earn six figures in the US if you're committed, work hard, and pick a good field. If you want to call what the article measures

> It's not hugely difficult to earn six figures in the US if you're committed, work hard, and pick a good field. If you want to call what the article measures "economic mobility", OK. Regardless of terminology, the point is that Americans think it's easier than it actually is to go from the bottom quintile of income to the top. If "it's not hugely difficult" translates to "more than a 7.8% chance of going from bottom quintile to top", then you'd be among them.