“…Collective voice, historically presented as trade union representation and collective bargaining (Bingham, 2016;Freeman and Medoff, 1984), enables employees to influence the process of wage determination thereby affecting pay levels and their distribution (Charlwood and Forth, 2009;Heery, 2011). Next to reducing pay inequality (Western and Rosenfield, 2011), trade unions attempt to improve the fairness of pay procedures by supporting employee participation in pay determination, formalising reward procedures, establishing due mechanisms to resolve possible disputes and providing transparency of the pay process through monitoring, audits and reviews (Heery, 2000;Rosetti, 2019). These elements bear close resemblance to Leventhal's (1980) six criteria for procedural justice: consistency across time and person, suppression of biases, accuracy of information, correctability of decisions, representation in decision making and maintenance of ethical and moral standards.…”