this paper studies the effects of the structural variables of the iranian industries sector on the welfare cost using to the structure-conduct-performance (scp) theory. in other words, we investigate the role of structural components and their effects on the size of the welfare cost in iran's industry sector. we have used the leibenstein's model to calculate the deadweight loss and then the pan...

In the real world there are groups which composed of independent units. The conventional data envelopment analysis(DEA) model treats groups as units, ignoring the operation of individual units within each group.The current paper, investigates parallel system network approach proposed by Kao and modifies it. As modied Kao' model is more eligible to recognize ecient groups, a new ranking method i...

This study aims to determine the level of efficiency maternal health services, explain factors that cause inefficiency in districts/cities province East Java. Using data envelopment analysis (DEA). The results showed variable return scale (VRS) test were better than constant (CRS), there was a change from relatively inefficient using VRS efficient regions VRS. partial regression AAB affect inef...