Sorry to barge in, but I want to point out that the above can happen purely on the basis of a combination of historical socio-economic and political factors, which doesn't have anything to do with biological wiring or anything like that.
To take just the example of European Jews, for much of history they were barred from taking part in public life feely. At the same time the Church prohibited Christian faithfuls from engaging in moneylending that involved any kind of usurious practices but allowed the Jews to get their hands dirty, so to speak, because by popular belief they were destined to hell anyway. Since there was no competition, European Jews over the centuries perfected the one thing they were allowed to do, especially in a rapidly changing times that had begun in the 16th C. And this was a kind of business for which there were (and are) a lot of willing customers.
This led to the development of a subset of very wealthy European Jews whom people resented for their money and material success.
This did not happen with the Mizrahi Jews who lived in the Eastern countries for centuries because of the absence of the conditions mentioned above. Although they found their niche in moneylending in the East too, but that was because their religious law permits them to engage in usurious practices with the gentiles, which was a factor also in play in Europe.