This paper analyzes the impact of competition and concentration on bank stability in the
Turkish banking industry over the period 2002–2012. The Boone indicator and the efficiency-
adjusted Lerner index are used as proxies for competition, while the non-performing loans
(NPL) ratio and Z-scores are used as proxies for bank stability. The main results indicate that
competition is negatively related to the NPL ratio but positively related to the Z-score. The
results further indicate that greater concentration has a positive impact on the NPL and a …