I suppose my stereo is much more modern. In the years of yore most of the population was rural so it seems natural that Jews would be part of that. However, Jews seem to be such excellent businessmen it is natural to think of them in that role.
It's an easy stereotype to make. More Jews end up as professionals (lawyers, doctors, accountants) than businessmen, though. ;)
You tend to find Jews all over doing all sorts of things, despite small numbers (I think there's only 13 million left in all the world). All parts of the political spectrum, all occupations and all over the world. My family, for example, has a large number of doctors, lawyers and soldiers (with, it seems, a particular aptitude for officers in field intelligence, and heavy weapon deployment)