abstract: 'Purpose The purpose of this paper is to study the association between firm size and hiring discrimination against women, ethnic minorities and older job candidates. Design/methodology/approach The authors merge field experimental measures on unequal treatment with firm-level data. The resulting data enable the authors to assess whether discrimination varies by indicators of firm size, keeping other firm characteristics constant. Findings In contrast with the theoretical expectations, the authors find no evidence for an association between firm size and hiring discrimination. On the other hand, the authors do find suggestive evidence for hiring discrimination being lower in respect of public or non-profit firms (compared to commercial firms). Social implications To effectively combat hiring discrimination, one needs to understand its driving factors. In other words, to design adequate policy actions, targeted to the right employers in the right way, one has to gain insight into when individuals are discriminated in particular, i.e. into the moderators of labour market discrimination. In this study, the authors focus on firm size as a moderator of hiring discrimination. Originality/value Former contributions investigated this association within the context of ethnic discrimination only and included hardly any controls for other firm-level drivers of discrimination. The authors are the first to study the heterogeneity in discrimination by firm size with respect to multiple discrimination grounds and control for additional firm characteristics.' affiliation: 'Baert, S (Corresponding Author), Univ Ghent, Ghent, Belgium. Baert, Stijn; De Meyer, Ann-Sofie; Moerman, Yentl; Omey, Eddy, Univ Ghent, Ghent, Belgium.' author: Baert, Stijn and De Meyer, Ann-Sofie and Moerman, Yentl and Omey, Eddy author-email: Stijn.Baert@UGent.be author_list: - family: Baert given: Stijn - family: De Meyer given: Ann-Sofie - family: Moerman given: Yentl - family: Omey given: Eddy da: '2023-09-28' doi: 10.1108/IJM-09-2017-0239 eissn: 1758-6577 files: [] issn: 0143-7720 journal: INTERNATIONAL JOURNAL OF MANPOWER keywords: Gender; Age; Firm size; Ethnicity; Discrimination; Hiring keywords-plus: 'LABOR-MARKET; FIELD EXPERIMENT; ETHNIC DISCRIMINATION; AGE; EMPLOYMENT; ACCESS; 1ST' language: English number: 4, SI number-of-cited-references: '44' orcid-numbers: Baert, Stijn/0000-0002-1660-5165 pages: 550-566 papis_id: 80896df17c2e9cc00aa7ff1695ce0439 ref: Baert2018doessize times-cited: '10' title: Does size matter? Hiring discrimination and firm size type: article unique-id: WOS:000438870200004 usage-count-last-180-days: '4' usage-count-since-2013: '41' volume: '39' web-of-science-categories: Industrial Relations \& Labor; Management year: '2018'