%0 Journal Article %T Evaluation of Market Power in Manufacturing Industries in Iran %J Journal of Economic Research (Tahghighat- E- Eghtesadi) %I University of Tehran %Z 0039-8969 %A Shahiki Tash, Mohammad Nabi %D 2013 %\ 07/23/2013 %V 48 %N 2 %P 43-64 %! Evaluation of Market Power in Manufacturing Industries in Iran %K Lerner %K Marginal Cost %K concentration %K Monopoly %K Industry %R 10.22059/jte.2013.35167 %X This paper using generalized Roeger's model calculated the Lerner index for Iranian active industries in 4-digit ISIC codes during the period 1995-2007. The findings indicate that the Lerner index has been between 8 to 16 percent in 38 industries among 131 ones. The index also in different industries shows that more than 50 percent of Iranian industries have monopolistic power such that they have generated a significant gap between price and marginal cost. Comparing the Lerner index with Herfindahl–Hirschman and four - firm concentration ratio indices gives this result that the industries with high concentration ratio have greater value of Lerner index so that The four-firm concentration ratio of 20 industries (among the 29 industries) has had a value more than 40.JEL Classification: F1 ،L1،L6 %U https://jte.ut.ac.ir/article_35167_19507dd5e78ec55f224e884252260c20.pdf