Vega, Gilberto; Campos, Javier - Facultad de Ciencias Económicas de la ULPGC - 2002
When major investors own shares in several firms in the same industry, the traditional approach to concentration measurement by the Hirschman-Herfindahl Index (HHI) fails to accurately reflect the level of competition in the market. To address this problem we derive a generalized HHI formula...