The author Russ Roberts runs the EconTalk podcast and is a well respected economist/journalist/thinker in the field, definitely worth reading for a fair assessment. Here he presents a few studies that go against general economic consensus popularized mainly by Piketty in "Capital in the 21st century" and through papers/writing by Krugman, Saez, Zucman, Stiglitz, etc. that most of the economic gains in the past 100 ye…
He's a fellow at Stanford School of Economics and he's a typical academic... Which is to say, that his articles must be taken independently. His opinions on other issues are not discussed, so it's easy to build a strawman about his other opinions. That also means that we must point out the fact that this article is only a small subset of data, that really tells us only what the data was collected on.
Of all the academic types at rightwing think tanks like AEI, Heritage, Cato, Russ Roberts is probably the best. I like him. But this issue - wealth inequality- is core to rightwing interests.