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G' dominant feature of the Basin and provides much of the impetus for both this EET study and earlier studies of the UCRB. The UCRB Optimization Model employed here draws extensively upon the earlier work, especially Udis et al., Udis, Howe, and Kreider, and Morris. As previously noted, the model uses an input-output characterization of the Basin's economy which is highly disaggregated given that the Basin I s economy is based primarily on the production of various natural resources, agricultural commodities, and recreation activities. In addition, this disaggregation emphasizes the heavy water using sectors of the economy, especially those involving agriculture or energy production. The character of the model, its operation and output, are described in more detail below. The Fixed Coe fficient, "Endogenized" Input-Output Sys tem In a Basin as large as the UCRB, there is a considerable amount of economic diversity Ln both the size and structure of economic sector ac ti vit ies.. In order to allow some of this divers ity to be captured by the input-output framework which is at the heart of the UCRB Optimization Model, the Basin has been subdivided into three economic regions--the Green Region, the Upper Main Stem Region, and the San Juan Region. This economic partition matches the Water Resources Counc il 's (wac's) hydrologic Aggregated Sub-Areas (ASAs) in the Basin. The three regions, the counties which compose them, and the UCRB as a whole are presented in Figure 2-1. Each regional economy has been divided up into forty-three local sectors. Each sector's relationship with other sectors in its region, other sectors in other regions, and the economic system outside the UCRB is depicted by the input-output structure. Each such relationship is summarized by a fixed input-output coefficient. This coefficient is a measure of the dollar