The importance of the consequences of sectoral aggregation, from the perspective
of input-output analysis is the foundation of this paper. This issue is addressed
from two perspectives: firstly, the effects of aggregation on the amount of information
contained in an input-output matrix, in this case the statistical theory of
information is used (Theil, 1957).
Moreover, the changes experienced by the output multipliers due to different
sectoral aggregations are analyzed. In this sense we have considered various
proposals as the hypothetical extraction (Dietzenbacher and Van der Linden,
1997) and Pure Linkage (Sonis and others, 1995).
The theoretical results derived from this study will be applied to the Input-Output
Table for Asturias (2010). We have also considered different standard aggregations
as NACE or CIIU, among others.