… is from the great Frank Chodorov‘s 1940 essay “Civilization or Caveman Economy?”; it is reprinted in Liberty Fund’s splendid 1980 collection, Fugitive Essays, of Chodorov’s writings, edited by Chuck Hamilton; the quotation here is from page 102 of this volume:
Every increase in trade facilities aids in the spreading of cultural values; and, contrariwise, every interference with trade results in a corresponding retardation of cultural progress. In other words, the freer the trade, the greater the advance in civilization, and the more restrictions there are on trade, the surer will be the retrogression of civilization.