Logomarca da FGV

Repositório FGV de Periódicos e Revistas

A decomposição do índice de Hirschman-Herfindahl

Rodolfo Hoffmann

Abstract


Firstly, a relation between the coeficient of variation and the Hirschman-Herfindahl index of concentration of an industry is deduced. Then, assuming that the firms in the industry are distributed in K groups, it is shown that the Hirschman-Herfindahl index is a function of the concentration among groups and the concentration within groups. The Hirschman-Herfindahl indexes for concentration among groups and within groups are defined so that the decomposition of the measure of concentration of the whole industry is coherent with the corresponding decomposition of the population variance.



DOI: http://dx.doi.org/10.12660/bre.v2n21982.3164

Praia de Botafogo 190 - sala 1032 - Rio de Janeiro - RJ 22250-900

tel: (21) 2551 4658 - Fax: (21) 2552-4898

sbe@fgv.br    


ISSN 1980-2447