This is from Mark Kleiman (via Brad DeLong):
Trade, Trump, and Downward Class Warfare, by Mark Kleiman: A conversation with my Marron Institute colleague Paul Romer yesterday crystallized an idea I’d been toying with for some time. In a nutshell: opponents of taxing the rich have destroyed, on a practical level, the theoretical basis for believing that free trade benefits everyone.
The Econ-101 case for free trade is straightforward: Trade benefits those who produce exports and those who consume imports (including producers who use imported goods as inputs). It hurts the producers of goods which can be made better or more cheaply abroad. But the gains to the winners exceed the gains to the losers: that is, the winners could make the losers whole and still come out ahead themselves. Therefore, trade passes the Pareto test.
[Yes, this elides a number of issues, including path-dependency in increasing-returns and learning-by-doing markets on the pure-economics side and the salting of actual agreements with provisions that create or protect economic rents on the political-economy side. It also ignores the biggest gainers from trade: workers in low-wage countries, most notably the Chinese factory workers whose parents were barefoot peasants.]
So when the modern Republican Party (R.I.P), in the name of “small government” and opposition to “class warfare,” set its face against policies to redistribute the gains from economic growth, it destroyed the theoretical basis for thinking that a rising tide would lift all the boats, rather than lifting the yachts and swamping the trawlers. Free trade without redistribution (especially the corrupt version of “free trade” with corporate rent-seeking written into it) is basically class warfare waged downwards. ...