Income inequality is caused by skills inequality.
If you want to make more money you need a marketable skill.
If you want to make a lot money; you need to own a business.
We need to focus here, and so maybe the word income inequality was the wrong word to use in the reasoning for this OP.
What bothers me is the income being possessed by idiots verses non-idiots today. Not sure how it's happening or what levers are being pulled, but idiots ending up in revenue streams valued at 6 and 7 figures is an eye opener these day's for sure.
It has nothing to do with skill sets, education, hard work or inheritance these day's, but it has everything to do with access points, and whose at those access points opening the doorways to complete and utter idiots these day's.
The words that Martin Luther King's speech illustrated for us, and sadly we had to have those words reminded to us once again in life (i.e.words we had practiced for year's prior as Christian's, but unfortunately they didn't include other's for stupid reason's at various times), were words we should have guarded forever.
Once forgotten is when this country became a socially engineered project that slowly caused the nation to abandon the evaluation of "character", and started this new inclusion concept based upon false premises that destroyed the concept of evaluating "character first", and then all else came afterwards.
Character based upon simple Godly concepts that all can easily agree upon, should of course be the first part of any interview (bring back character references and a test of one's character). After that it should be determined what one's potential should be, but based upon character first.
Total idiots should not be in possession of big bucks causing chaos in society. We've now seen this film, and it's a horror show.
That's my take....