Conclusions
In this work the DEA method was used in order to estimate the relative efficiency
of the commercial banks that operate in Greece. A brief introduction to the Greek
banking system and the changes that were implemented was presented. In addition,
the data employed was described as well as the application of DEA method in our
case study. The results demonstrated that the inefficient DMU's need to make a great
effort mostly managerial in order to increase their outputs and become efficient. Finally a
suggestion was made regarding the inputs, using the account shareholders' equity.