A group of psychologist at UC Berkeley have been studying the relation between ethical behavior and income levels. Interestingly those who were categorized as upper class were more likely to behave unethically than those categorized as lower class. Does an excess of money turn people into dishonest individuals? I don't think you can generalize but the video below shows some intriguingg (to me at least) findinigs; e.g. who would have thought richer people were much more likely to take candy meant for children than poorer people :O
Money on the Mind - YouTube