> If you only know one thing about someone

You can know a great deal about someone at birth, such as race, gender, country of origin, eye color etc. Yet you can accurately predict someone’s wealth at age 60 by looking at their parent’s wealth even though a babies income is generally 0.

Further wait until someone’s 10 and you can measure IQ, grades, etc and parents wealth is still #1. Wait even longer and high school GPA still isn’t nearly as useful.