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Jews have also practiced negative eugenics by disallowing marriages for poor (and likely less intelligent) Jews during certain periods when states explicitly limited the number of Jews.
Poor Jews have also been particularly likely to leave Judaism.
This since many people have posed as Jews for reasons such as being able emigrate from the Soviet Union.
This has caused the measured average IQ of Israeli "Ashkenazi Jews" to be lower than the measured average IQ of non-Israeli Ashkenazi Jews.
This hypothesis may also explain the relatively higher mathematical/verbal ability by this being more important in occupations such as money-lending, tax collection, and import-export trading.