Bendix, Reinhard; Lipset, Seymour M.; Malm, F. T. - In: Industrial and Labor Relations Review 7 (1954) 2, pp. 246-261
The concept of "noncompeting groups"--for example, discrete dusters of occupations, such as manual labor, skilled mechanics, business executives, professionals, and the like, among which movement of individual workers is extremely limited--occupies a prominent role in wage and employment theory....