An alternative set of make and use tables that is more closely based on the 1987 Standard Industrial Classification System (SIC) was also prepared (see the box "Data Availability" on page 46). The alternative tables conform more closely to the current SIC establishment-based data collection system by showing the primary and secondary products in the industries that produce them. As a result, the industry definitions, which are used to determine the columns of the use table and the rows of the make table, may differ from those used in the traditional I-O tables./1/ For some industries, the differences may be significant. For example, auto repair output from the retail trade industry in the alternative I-O tables is only about 40 percent as large as auto repair industry output in the traditional I-O tables. Generally, the redefinitions affect the following industries: Manufacturing activities by nonmanufacturing industriesfor example, bread making in the retail trade industry; trade activities by nontrade industriesfor example, buying and selling excess materials from inventory by manufacturing establishments; and service activities by industries in which services are not primaryfor example, eating-and-drinking-related activities in the hotels and lodging places industry. However, construction activities performed by nonconstruction industries are redefined to construction in both the traditional and alternative tables.
The commodity definitions, which are used to determine the rows of the use table and the columns of the make table, are the same as those used in the traditional tables. Because SIC-defined industries include heterogeneous input mixes and production processes, alternative total requirements tables are not prepared.
The alternative tables are particularly useful for comparisons of industry data from the accounts with other SIC-based data, such as the data for gross product by industry and for capital stock that are prepared by BEA and the employment data that are prepared by the Bureau of Labor Statistics.
1. For a discussion of the I-O industry classification system used for the traditional tables, see Lawson, 4647.