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<br />improvement achievable by expending an <br />additional dollar is equal for all control <br />me thods. <br /> <br />2. The water quality selected should be <br />such that the additional cost for one unit of <br />improvement should be equal to the marginal <br />benef its to the downstreetm users from that <br />improvement. By this rule, the maximum <br /> <br />. <br /> <br />W <br />N <br />tv <br />CD <br /> <br /> <br />benefits for the entire river basin are <br />ach ieved. <br /> <br />The first criterion can be found by <br />comparing the dual variables of Equation 22' <br />of each alternative policy. The dual value <br />of Equation 22' indicates the reduction of <br />maximum joint returns when the water quality <br />standard is increased by one unit. <br /> <br />28 <br />