Eco-efficiency analysis of paper mills along the Huai River: An extended DEA approach
The objective of this paper is to estimate the ecological efficiency of paper mills along the Huai River in China. The main characteristic of the ecological efficiency evaluation problem is that an undesirable output of biochemical oxygen demand (BOD) and a non-discretionary input (BOD emission quota) should be considered simultaneously. By analyzing the impacts of the non-discretionary input on decision-making units' (DMUs) desirable and undesirable outputs, a non-radial output-oriented DEA model is proposed. In the proposed model, we describe a new approach of defining reference set that requires reference units operate in a similar environment on average. We employ the model to provide efficient inputs/outputs targets for DMU managers to improve DMUs' efficiencies. Based on the developed model, impacts of the non-discretionary input on DMUs' returns are also analyzed. We illustrate the proposed model, using real data, for 32 paper mills along the Huai River in China.
Volume (Year): 35 (2007)
Issue (Month): 5 (October)
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