The effect of investment in agriculture, oil, industry, mining and services sectors on Income distribution in Iran Karimi Mojtaba*, Bazraei Maryam**, Hajmousavi Sarah*** *M.A., Planning and Analysis of Economic Systems, Islamic Azad University, Central Tehran Branch, Tehran, Iran **M.A., Economic Sciences, National University of Semnan, Semnan, Iran. Email: ***M.A in Economic Development and Planning, Islamic Azad University, Central Tehran Branch, Tehran, Iran Online published on 5 July, 2014. Abstract The main purpose of this study was to estimate the impact of investments in four major sectors of the economy (agriculture, oil, industry, mining and services) on the distribution of income (expense) in Iran. For this purpose, first time vigesimals Gini coefficient of income (expense) in the years 1350 to 1390 are estimated with the parametric method. To analyze the effect of variables on the analysis of economic inequality and inequality, Model as a system of simultaneous equations vigesimals factors affecting seemingly unrelated (SURE) has been used. The results show that investment in the agricultural sector, the share of the third and fourth vigesimals have had significant negative effects, vigesimal share has increased in the fifth investment work in the service sector was significant only for the first vigesimal share. Effect on investment in the oil sector is negative and significant first and second vigesimals but on the fifth vigesimal estimate is positive and significant. Investment in the mining industry and has had a positive and significant effect on the second vigesimal While significant negative effect on the share of fifth vigesimal obtained. Top Keywords Income distribution, government spending, inflation, tax revenue, investment. Top |