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Show As with Appendix Table 2, Appendix Table 3 is read down the column; each entry gives the direct and indirect requirements from a sector in a row, generated by a one- dollar change in the final demand of the sector in the column. Therefore, supposing that the final demand of Sector 18, Primary Metals Manufacturing, increased one dollar, one can see, by looking at the intersection of column 18 ( Primary Metals) and row 4 ( Metal Mining), that the total direct and indirect effect is to increase Primary Metals purchases from Metal Mining by $ 0.27975. Sectors Ideally, firms within each sector would produce a homogeneous product ( or service); a criterion that led to a large number of sectors. One constraint on the number of sectors was, of course, the funds available to finance the project. There was also the legal problem of identification, i. e., there had to be enough firms in each sector that no individual firm would be identified from the published results. On the other hand, much of the value of input- output would have been lost if industries were aggregated on too broad a basis. If the sector did not include a well- defined economic activity, then the resulting analysis would be of little use to anyone. The number of sectors used in the Utah Input- Output study was determined, to a large extent, by the available funds. Within a limit of approximately 40 sectors, an effort was made to maintain as much homogeniety as possible and at the same time keep the variability of sector outputs within a reasonable range. The following sector definitions are included to provide further information into sector classifications. 73 |