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It only fails to be encouraging if you're ideologically opposed to the theory that "personal efforts matter".

> This is basically saying personal efforts matter. I believe this is not most upward mobility advocators want to hear.

Surely you're not implying that 'upward mobility advocates' mean that people will magically become richer while doing nothing?

There are people thinking all need to be done is just "fix the system" and then people who were making efforts will be selected.

It is encouraging because these particular children have upward mobility.