Data envelopment analysis (DEA) is a widely used technique for the performance evaluation of decision making units. Cost efficiency is one of the important factors for the financial evaluation of a system. Financial factors are important as they can be used in sustainable supply chain management. There are many cost efficiency models in DEA. In this paper, to evaluate the cost efficiency, we deal with the undesirable outputs by DEA and the piecewise linear theory. The weight restrictions on criteria are incorporated into the proposed model. A case study is given.
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