In my mind, the answer to the question of why Jews are so smart is relatively simple - the Match Maker. The reason for this is that the ideal match for a Jewish couple was an intelligent boy, commonly a Yeshivah student, and ideally the son of a Rabbi; with a girl from a wealthy family. Or the daughter of a Rabbi with a wealthy and intelligent boy. Extend this genetic line over multiple generations and you get highly intelligent individuals with a strong capability in the commercial sector. Of course there are exception but that 'ideal' pairing has a lot to do with the cause of Jewish attributes.
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Preliminary report: Shooting attack in East Jerusalem's Damascus Gate (Haaretz)
from the article: What makes Jews so smart?