Investigating the Efficiency of Branches of Refah Bank Based on Stochastic Frontier Analysis Approach

This paper studies the technical efficiency of branches of Refah Bank in Tehran Province in 1387 based on Stochastic Frontier Analysis (SFA) and Translog production function. The findings show that the branches of Milad and Social Securities have enjoyed the highest technical efficiency, getting to about 96 percent, standing as the reference set. The branch of Shush Square suffers from minimum technical efficiency, estimated about 29 percent. Moreover the average efficiency of north branches of Tehran is estimated 87 percent and the south ones 79 percent. Overall, the average level of technical efficiency of all branches is found to be 81 percent. So that Refah Bank branches could haveproduced 19 percent more output using the same level of the inputs just by improving the combination of inputs without any increasing needed. The elasticity of output with respect to labor with higher education is 0.39 having contributed to output much more than other inputs.