Geographic Concentration in Industry of Iran and Effective Factors in it

Level of geographic concentration and Condition of distribution and dispersion of generative activities and industrial firm's establishment in different regions is dependent to firm's decisions for locate in a special region. In this paper, we have paied to study for variation in trend of geographic concentration in industry of Iran between two years (1376- 1385) with measuring level of geographic concentration according to employment and add value by using the EG (Ellison and Glaeser) index, and then we have evalued impact of effective factors in this kind of concentration by a section model that, it is a kind of econometric model. Results of this measuring showed that geographic concentration in our industry is very important.Also we found that return to scale, relation between industries, average payable rights, they have significant and positive effect on index of geographic concentration.