Some people are going to say intelligence (pshaw), but... The only acceptable professions to Jewish mothers are doctor, lawyer and maybe investment banker. On

Some people are going to say intelligence (pshaw), but... The only acceptable professions to Jewish mothers are doctor, lawyer and maybe investment banker. On top of that, there are extreme social pressures to succeed. Add a tight knit community and blamo, generations of high paid Jews. Seriously, culture has a far greater impact on success than intelligence.