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I don't mean to suggest that there should be *no* gap between rich and poor - I think history shows quite decisively that it won't ever go away and even comparatively egalitarian countries have some level of gap. I do question, though, whether having such an egregious gap is a healthy or desirable thing - such a huge concentration of wealth effectively guarantees dynasties of enormously wealthy and powerful people, vastly disproportionately powerful special interests, and declining social mobility and equality of opportunity.
On the other hand, though, this development seems so extensive and so entrenched that it looks too late to do anything about it. So chances are we will slide slowly into a modern equivalent to feudalism...