We ask, instead, why there is such startling homogeneity of organizational forms and practices; and we seek to explain homogeneity, not variation. In the initial stages of their life cycle, organizational fields display considerable diversity in approach and form. Once a field becomes well established, however, there is an inexorable push towards homogenization.

paul j. dimaggio & walter w. powell

Dimaggio, P. J., & Powell, W. P. (1983). The Iron Cage Revisited: Institutional Isomorphism and Collective Rationality in Organizational Fields. American Sociological Review, 48(2), 147–160. https://doi.org/10.2307/2095101