Wielkość banku spółdzielczego a jego efektywność

The aim of the study was to assess the efficiency of cooperative banks depending on their size. The sample was constituted of 300 cooperative banks affiliated in the Bank of Polish Cooperatives. The size of the bank was determined using four characteristics: total assets, the equity, the number of outlets and the number of accounts. With the use of the point sequence indicator the ranking of banks was created, and then with the use of quartiles the banks were divided into four groups of similar size. Efficiency was assessed with the use of the Data Envelopment Analysis (DEA) method based on the BCC and CCR models oriented on input and selected efficiency indicators. Changes in productivity over time were estimated by using Malmquist Index. The results indicated that among the analysed cooperative banks the greatest banks were the most efficient. Small banks were characterized by higher efficiency than medium size banks, but they were less efficient than the biggest banks.