In this paper, we present results from of a large-scale replication of Hodgson and Rothman's (1999, The Economic Journal, 109(453): 165–186) seminal analysis of the institutional and geographical concentration of authors publishing in top economic journals. We analyze bibliometric data of more than 49,000 articles published in a set of 30 highly influential economic journals between 1990 and 2018. Based on a random sample of 3,253 authors, we further analyze the PhD-granting institutions of the authors under study to better scrutinize the claim of an ‘institutional oligopoly’. The findings confirm the long-term persistence of strong oligopolistic structures in terms of both, author affiliations as well as PhD-granting institutions.