Why are so many billionaires Jewish?

I was reading about the Russian oligarchs who dominated Russia economically during the 1990s and noticed that 6/7 of them were Jewish despite Russia being only .50% Jewish. I then typed in Jewish Billionaires in Google and found that over 1/3 of the 50 richest people on the Forbes 400 are Jewish and ~ 25% of the... show more I was reading about the Russian oligarchs who dominated Russia economically during the 1990s and noticed that 6/7 of them were Jewish despite Russia being only .50% Jewish. I then typed in Jewish Billionaires in Google and found that over 1/3 of the 50 richest people on the Forbes 400 are Jewish and ~ 25% of the overall list, which is amazing since they are only 2% of the population. These are facts, not opinions or assertions. How come they are so disproportionately successful?
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