An Investigation of Concentration in Iran Industrial Sector Based on Structural and Non-Structural Model Approaches

This paper evaluates industrial market structure using structural model and non-structural model in 131 industries with 4 digits ISIC code during 1996 to 2008. The results of concentration indicators show that competition factor in Iran''s industry sector is are low. On the other hand، analysis degree of competition and monopolistic in indicate that according to Boone indicator (-0. 12) and Herfindahl-Hirschman index (0. 24)، Iran''s manufacturing industries sector operate under conditions of monopolistic competition، and also Lerner index (0. 36) confirm this result. «Manufacture of Motor Vehicles» with a share of equal to 16. 38 percentages has the biggest relative sales share، that base on concentration indicators estimate، operates close to monopolistic condition.