Abstract
During the first two decades of 1900, Duguit vigorously criticized the contractual analysis of the collective labour agreement. The charge of the dean of Bordeaux, and his proposals for a regulatory approach, will resonate across the Atlantic. In the Yale Law Journal of 1917-1918, the article "Collective Acts as Distinguished from contracts" summarizes the thinking of the Duguit. Although the latter is translated and read in the United States, the scope of his thinking remains uncertain. Indeed, the progressive structuring of the legal framework of the collective agreement and the negotiating capacity of trade unions only very rarely reflects Duguit's ideas.