“…Their results, based on Italian data, show that firm-level bargaining leads to a significant wage gain for both white-and blue-collar workers. Since then, the existence of a positive wage premium associated with firm-level collective agreements has been confirmed for other countries (OECD, 2018), including Belgium (Rycx, 2003), Denmark (Plasman et al, 2007), France (Leclair et Petit, 2004), Greece (Daouli et al, 2013), Ireland (McGuinness et al, 2010, Portugal (Cardoso and Portugal, 2005), Spain (Card and de la Rica, 2006;Dell'Aringa and Pagani, 2007) and Sweden (Granqvist and Regner, 2008). The wage premium associated with firm-level collective agreements (with respect to higher-level agreements) is generally estimated at between 3 and 7%.…”