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~ i I linkage is modeled. In regions like those of the UCRB (regions with small final markets), this is probably quite an adequate description since the new energy facilities will be exporting all or most of their production. Adjustments for relative price changes were made in the "1980" input-output coefficients in recognition that relative price changes generate changes in input-output coefficients, even with physical input proportions held constant. In order for the model to be consistent, the relative prices embodied in the coefficients must be the same as those embodied in the final demand and total gross output measures used in the model. Since these later are measured in 1970 dollars in the current version of the UCRB Optimization Model, the "1980" coefficients which. were originally measured in 1960 dollars had to be transformed to the 1970 dollar standard. . This was accomplished by constructing 1960 and 1970 price indices for each sector and pre and post multiplying the input-output array in 1960 dollars by vectors of ratios of the . d. 1 In lees. The regions of the UCRB were tied together economically by arrays of interregional input-output coefficients. These coefficients have the same meaning as the regional coefficients except that the producing and purchasing sectors are located in different regions of the UCRB. These coefficients are based upon the aggregate trade flows among the regions as presented in Udis et a1., and are transformed into coefficients as in Morris' An Optimization Model 2 1 The technique employed here is the same as used in Optimization Model ..., pp. 73-85, but the indices used were based upon more detailed Department of Commerce price series. Morris, An recalculated 2Glenn E. Morris, An Optimization Model..., pp. 86-114.