substances having economic value
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Explanation:
Total economic value (TEV) is a concept in cost–benefit analysis that refers to the value derived by people from a natural resource, a man-made heritage resource or an infrastructure system, compared to not having it.
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Answer:
Total economic value (TEV) is a concept in cost - benefit analysis that refers to the value derived by people from a natural resources , man - made heritage resources or an infrastructure system compared to not having it.
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