“…Labor unions are advocates of DB pension plans, and many plans were collectively bargained for when labor unions were strong. They are the most common proxy for labor bargaining power in the literature (see, e.g., Chang et al, 2012; Duygun et al, 2018; Klasa et al, 2009; Matsa, 2010; Shivdasani & Stefanescu, 2010). In this sense, we predict a negative correlation between the industry unionization rate and probability of a pension freeze, which is confirmed by the first‐stage regression results in Table 8, where we report the IV regression results.…”