Finding 2:
The undesirable output can either have a positive or negative effect on the efficiency score.
From Table 2, it can be seen that after incorporating the undesirable output, the results are altered. However, this change fails to explain the presence of undesirable output. In fact, the efficiency score should change in a manner which unambiguously reflects the presence of the undesirable output. For example, the desirable output of dry port A is greater than dry port B. However, when accommodating the carbon emissions generated by both dry ports, dry port B generates less CO2 than dry port A. Taking into consideration both these aspects for comparison, dry port B behaves better in the environmental aspect because it produces less CO2 per unit of desirable output. Therefore, dry port B can be regarded as more environmentally efficient compared with dry port A (Nakashima et al, 2006).
Finding 2:
The undesirable output can either have a positive or negative effect on the efficiency score.
From Table 2, it can be seen that after incorporating the undesirable output, the results are altered. However, this change fails to explain the presence of undesirable output. In fact, the efficiency score should change in a manner which unambiguously reflects the presence of the undesirable output. For example, the desirable output of dry port A is greater than dry port B. However, when accommodating the carbon emissions generated by both dry ports, dry port B generates less CO2 than dry port A. Taking into consideration both these aspects for comparison, dry port B behaves better in the environmental aspect because it produces less CO2 per unit of desirable output. Therefore, dry port B can be regarded as more environmentally efficient compared with dry port A (Nakashima et al, 2006).
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