Wskaźniki koncentracji jako miary konkurencji w sektorze bankowym

The aim of this paper is to examine the impact of changes in concentrationcaused by, among others, mergers and acquisitions on the level of competitionin the Polish banking sector in the years 1997–2012. The Lerner index was usedto measure competition in the Polish banking sector while CR5 and HHI indiceswere used as a measure of concentration. The article also addresses the impactof competition on risk in the Polish banking sector. The results of quantitativeanalysis showed that in the period before the financial crisis (1997-2007) the levelof concentration had a positive impact on the level of competition, i.e. the increasein the concentration was accompanied by increase in the level of competition.