Little anecdote.
With the rise of racial tensions I got interested about violence against jews (among others) and absurd claims on their financial lobby etc.
Some told me that jews were segregated in middle ages, only allowed as clerks, thus their presence in finance.
Someone then corrected me, saying it's in the ballpark but not true. The reason why jews ended up in banks, is that Christians (and probably other groups/religion) despised loans with interests, usury. They saw it as immoral and fake value (as opposed to work). But it was allowed for other non christian groups to lend money as long as interests weren't indecent (say 5%). From the few I read, jews had a long history of being clerks and were good at math and bookkeeping (at a time where education was rare) so they fit the bill (sic) perfectly. There are a lot to say about the dynamics there, associations, then violence, cycles.
Now reading this in the 2000s I was shocked that the old church guys didn't allow to profit from another's need and multiplying money for nothing. It felt so much more humane, social.. honorable, candid.. And that the subject of money was sensitive even that long ago; somehow amazing.
Nowadays banks, finance, ROI, etc etc are all unquestionable, but it used to be different.