Investment function in different sections and its effects on economic growth of Iran

The role and importance of investment has been emphasized in the process of economic development and growth of the societies in most of the majority of economic development and growth theories. Taking into account the deficiency in investment recourses and the necessity for the optimized specialization of these recourses in order to stimulate economic growth, it is necessary to correctly identify the relative benefits of a country in specializing in vestment recourses and limited recourses must be used in order to make economic growth faster through directing investment recourses towards the most productive and functioning sections. This research was done along this topic with the aim to study the investments already made in agriculture, oil and gas, industries and mines, and services sections after searching for a section or a number of sections in which investment regarding making domestic gross production growth significantly faster. For this purpose first the criterion of the ratio of final capital to production is used and through explaining it for each of the countries economic sections in the period between 1338- 1390 the ratio of final capital to production is calculated. Since there is a difference in opinions regarding the functioning of this criterion an endogenous growth model was used in the following stage to study the efficiency of the made investments in different sections of economy in the country in the mentioned period.