I agree that is a problem. However, many people assume the rich are some monolithic group, hence the maxim "the rich get richer," which most people take to mea

I agree that is a problem. However, many people assume the rich are some monolithic group, hence the maxim "the rich get richer," which most people take to mean a rich person gets richer, not most rich people fall from that class and different people enter that class with even more wealth. Thus I commented on the fact (it seems) that rich people usually do not stay rich, for any reasonable definition of rich. Other people become rich.