برآورد پارامتر يكي نسبت تمركز صنايع در ايران

Estimating the Parametric Proportion of Concentration in the Iranian Manufacturing Industries

This paper presents the estimated ratio of employment in the manufacturing industries sector of Iran by 24 industries for the years 1994 and 1997. It has used three distribution Functions of Pareto, Normal Logarithms, and Power Logarithms and by employing parametric techniques In all cases the normal logarithm has offored the highest values and because of this feature, it has been selected as the most appropriate model of estimating the proportion of concentration in the Iranian manufacturing industries. Based on this model, 24 different industries in this sector have been arranged from the most monopolistic to the most competitive. The results indicated that concentration in industries such as apparel and clothing, processing, dying and finishing of fury animal skins; leather tanning and preparing; manufacturing bags, suitcases, saddlery and harness, shoes making; wood and woodon articles, cork and goods made of straw; printing and publishing of pre-recorded media; coke production industries, oil refineries and atomic fuels; production of plastics and plastic items; producing other non-metal minerals; producing fabricated metal products; making furniture and other products not classified else where, have been increased from 1994 to 1997.ʹtherefore, all economic aftermaths resulted from enlarging monopoly, lower demand and production, and as a .result decrease in the productive employment at macroeconomic level prevails.