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The economic modeling analyses involved athree-stage approach. First, aninput-output (I-O) <br />model was developed for each of the seven States in the study region: Arizona, California, <br />Colorado, Nevada, New Mexico, Utah, and Wyoming. Second, aninput-output model was <br />developed for the entire Colorado River Basin region. Third, a computable general <br />equilibrium (CGE) model was developed for the study region. This staged approach allowed <br />the team to determine State, regional and the national effects of proposed critical habitat <br />designation for the period 1989 to 2020. For each model -stage, a present and future <br />economic projection without the impacts of species listing and designating critical habitat <br />(without fish scenario) was contrasted with a present and future economic projection with the <br />designation of critical habitat (with fish scenario). A detailed discussion of the I-O and the <br />CGE modeling approaches can be found in Chapters II-7 and II-8. <br />Volume I presents the economic impacts of the proposed designation of critical habitat as <br />required by the Act. These impacts are incremental impacts over and above those associated <br />with species listing. Section 2 presents information on critical habitat in general, species <br />listing history, and proposed critical habitat designation for these four endangered fishes. <br />Section 3 discusses the physical and economic settings of the Colorado River Basin. An <br />overview of the economic modeling framework is found in Section 4. Section 5 discusses the <br />biological and economic dimensions of the study. This discussion provides the connection <br />between the biological requirements of the fishes and associated economies. The State- and <br />regional-level incremental impacts of proposed critical habitat designation are in Section 6 <br />and Section 7 presents the national economic efficiency impacts. <br />I-3 <br />