… is from page 311 of Deirdre McCloskey’s excellent 2019 book, Why Liberalism Works: How True Liberal Values Produce a Freer, More Equal, Prosperous World for All:
Protectionism in foreign trade has regularly damaged a great many poor people and helped a few rich people. Protectionism in domestic trade, as in the US farm program and the EU’s agricultural policy, has done the same.