For the past century, political polarization has closely tracked income inequality, and there’s every reason to believe that the relationship is causal. Specifically, money buys power, and the increasing wealth of a tiny minority has effectively bought the allegiance of one of our two major political parties, in the process destroying any prospect for cooperation.
And the takeover of half our political spectrum by the 0.01 percent is, I’d argue, also responsible for the degradation of our economic discourse, which has made any sensible discussion of what we should be doing impossible.
Disputes in economics used to be bounded by a shared understanding of the evidence, creating a broad range of agreement about economic policy. To take the most prominent example, Milton Friedman may have opposed fiscal activism, but he very much supported monetary activism to fight deep economic slumps, to an extent that would have put him well to the left of center in many current debates.