ABSTRACT: The steady numerical decline of union membership has become a perennial of American political economy. While this decline is matched by pretty much every wealthy country on earth, peak union density in the United States, about 34 percent of non-farm workers in the mid-1950s, never reached the heights attained in Europe or even Canada. the propor-tional drop puts the U.S. labor movement at a lower baseline today than these other countries.
A Mon, study studied this question.