... with a straightforward disaggrega- tion of national accounts totals. Finally, a SAM always has a matrix format 72 Pleskovic, B. and Trevino, G., The Use of a Social Accounting Matrix Framework ... in a Social Accounting Matrix, The Review of Income and Wealth, 25(1), 65-81, 1979. Grootaert, C., The Labor Market and Social Accounting: A Framework of Data Presentation, Living Standards ... supplementary data can be obtained from a variety of sources. Minimally needed are: a. National Accounts, these being the natural source for a preliminary esti- mate of national aggregates....