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Recent exchanges in the literature on the identification and role of key sectors in national and regional economies have highlighted the difficulties of consensus regarding terminology, appropriate measurement as well as economic interpretation. In this paper, some new perspectives are advanced which provide a more comprehensive view of an economy and offer the potential for uncovering alternative perspectives about the role of linkages and multipliers in input-output and expanded social accounting systems. The analysis draws on some pioneering work by Miyazawa in the identification of internal and external multiplier effects. The theoretical techniques are illustrated by reference to a set of input-output tables for the Brazilian economy. The paper thus provides a more comprehensive view than the ones proposed by Baer, Fonseca, and Guilhoto (1987), Hewings, Fonseca, Guilhoto, and and the recent contributions of Clements and Rossi (1991, 1992) that draw on some earlier work of Cella (1984).

Recent exchanges in the literature on the identification and role of key sectors in national and regional economies have highlighted the difficulties of consensus regarding terminology, appropriate measurement as well as economic interpretation. In this paper, some new perspectives are advanced which provide a more comprehensive view of an economy and offer the potential for uncovering alternative perspectives about the role of linkages and multipliers in input-output and expanded social accounting systems. The analysis draws on some pioneering work by Miyazawa in the identification of internal and external multiplier effects. The theoretical techniques are illustrated by reference to a set of input-output tables for the Brazilian economy. The paper thus provides a more comprehensive view than the ones proposed by Baer, Fonseca, and Guilhoto (1987), Hewings, Fonseca, Guilhoto, and and the recent contributions of Clements and Rossi (1991, 1992) that draw on some earlier work of Cella (1984).

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In this paper, two literatures that have explored the structure of economies are brought together. In the first case, the approaches to key sector identification (initially associated with Hirschman and Rasmussen) that were modified by Cella, Clements and Rossi and Guilhoto et al. to reveal what may be referred to a pure linkage approach are related to the concerns of Miyazawa and his identification of internal and external multiplier effects. While Miyazawa was interested mainly in identifying the sources of change in an economy, his approach shares considerable commonality with the new ideas in key sector identification in which a sector or set of sectors are separated from the rest of the economy. Hence, in both cases, a decomposition of the economy needs to be considered; the present paper reveals the similarity of perspective and provides the formal link between the two methodologies.