What bothers me, is that the tremendous difference in both income and wealth, took place only recently in the US. It occurred during the period immediately after a series of big changes in the late 1970’s and early 1980’s, and has gotten steadily worse since then.
Income and wealth inequality isn’t a problem in and of itself. As has been pointed out, in a capitalist society, there will always be differences. However, one of the most common things that tend to go wrong in capitalist societies, is that those with wealth, tend to want to alter the government in order to increase the flow of capital into their pockets, or at least to preserve what they have, artificially. And a CHANGE in the degree of difference, especially if it occurs over a relatively short time, can, and usually is, a signal or a symptom of exactly that kind of corruption.
It happened in the 19th Century, as the top earners used their wealth and influence to arrange for monopoly control, and after that, to prevent new competition or innovation from occurring at all. Worst of all, some big businesses began to usurp the United States Federal, State, and local governments entirely, actually controlling cities that grew up around their factories.
Then as now, labor’s concerns about pretty much EVERYTHING were actively suppressed by the business powers, and they were assisted in this by the government, again due to the influence that money carries with it.
Therefore, I don’t think that the concern or focus should be on establishing some “prime income ratio” to shoot for. Something much more challenging to deal with, needs to be done, using increasing disparity as a signal that it needs doing. That is, we need to look at HOW great wealth is being “created,” to make sure that the wealth IS actually being CREATED, and who is actually creating it.
I think that “fake wealth” is being created, whenever the change that brings more profit, is the reduction of wages. I think it’s “fake wealth” that is created by speculation for rising and falling stocks. I think it’s “fake wealth” that is created from playing the money exchange game, playing off the shifting trade values of currencies. Fake wealth is created big time, when changes are made in accounting regulations, allowing different things to be called profits and losses.