Also.I grew up in a Jewish neighborhood and had a career at a world famous hospital.As a result I have long exposure to Jews and have a pretty good understanding of them (American Jews at least).I know that not all,or even most,Jews are greedy or scheming...but a noticeable percentage are.
Also,in the 30s...40s..and even into the 50s American Jews played a noteworthy role in the Mafia.IIRC,Murder Incorporated was largely,if not entirely,Jewish.
A ridiculous statement. You can plug any ethnic, religious or racial group into your formula. Not all Irish are drunks but a noticeable percentage are. Not all blacks are lazy... You get the point.
My dad suggested scavenging in jewish alleys for merely slightly damaged toys, to fix them. Assuming the jews were not intensely mechanical. It worked at his time. My hunch is that they have fixed this since then. Generalizations are useful, but they do wobble.