I'm surprised the words "capital gains" are not mentioned at all in the article. It's already well known that the richest of the 1% did not get there purely through a high wage/salary. Some might blame loose monetary policy for providing easy money for the 1% in the USA (if you can borrow money and speculate for free, why not, after all), but if that's the case Japan really stands out; they've been QE'ing since their…
This talks about the 1%, not the few super rich, which is less than 1 out of 100.
It's confusing because often when people say "the 1%" they actually mean multi-millionaires; which is less than 1%.
Most 1%'ers are elite professionals. And this articles argues they make more money because of regulation that creates barriers to competition.
The super rich multi-millionaires and billionaires is a different story.