Abstract
Air pollution control expenditures are expected to vary widely among firms. Judgments on economic impact should not be based on the absolute value of the costs. Instead costs should be examined relative to denominators common to emitters. Accordingly, indicators of impact are desirable which permit comparisons between emitters. The purpose of this paper is to suggest indicators which facilitate such comparisons and to develop realistic examples that demonstrate their usefulness. Two model gray iron foundries are used as examples. Four alternative control systems are proposed for each model plant. Indicators are formed by comparing the investment and annual costs of the control systems to the financial, engineering, and production characteristics of the model plants as well as to effectiveness measures of the control systems. The characteristics of the model are represented by data on: investment in melting equipment, plant assets, retained earnings, value of castings, net income, melt rate, control system...
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