Ironically, that has created a populist backlash that has vaulted even worse economic ideas into power.
Anyone read "Capitalism in the 21st Century"? It's long and dense, but it does make some excellent, well-supported points about the structure of an economy that explains the current situation very well with historical antecedents.
This won't do it justice, but: inequality always increases, by definition, if the returns on capital outstrip the overall growth in the economy. (Think through that if it's not obvious; it's literally a mathematical truth.) The book argues that history is a series of long, slow accretions of wealth, with increasing inequality, until some shock (usually a violent revolution) overthrows the old system, resets inequality, and the cycle starts again. The latter half of the 20th century, for the US, was one notable exception: growth outstripped returns to capital, so the benefits of that growth were widely shared: inequality decreased. That trend ended in the ~1980s, and the widening inequality gap has fueled unrest.
And the book points out that we've seen this show before. I think we're in the "history repeating itself as farce" phase, though.