Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
We study the intense wave of mergers among Italian mutual cooperative banks (Banche di Credito Cooperativo, BCCs) trying to assess whether those mergers were efficiency-enhancing. Specifically, we employ a two-step procedure: first estimating bank-level cost efficiency scores over 1993–2013 via a stochastic frontier approach, then trying to explain the estimated BCCs' scores with a set of merger status dummies (never merged, before the first merger, merged once, merged twice, etc.) and a vector of control variables. We find that mergers increase mutual banks' cost efficiency only in 5% of the mergers, precisely those in which a BCC has merged at least three successive times with other BCCs. Besides, we conjecture that the serial mergers led those BCCs to reach remarkably large size and this could harm especially marginal borrowers (i.e. those likely served by smaller banks but neglected by bigger ones), with strong adverse impact on development and inequality and violating BCCs' ethics and mission.