system
A chat on subreddit /r/NoStupidQuestions
human
I went to Catholic school and IDK how true this is all forgive my ignorance if it's not but I was taught that the reason Jews control a lot of the banks and financial sector was that because they were banned from owning property and businesses for a long time, the only business they could do was banking, which naturally led to that industry being predominantly run by Jews
gpt
Not quite.

In medieval Europe, lending money was a sin according to the catholic church. 

However, there was a need for loans, especially among the richer segment of society, and Judaism had no prohibition against it. Thus a lot of the lenders were Jewish.

And sometimes, it was cheaper for the king or aristocrat to kill the non-Christians than to pay the loan back...