Economic  Modeling: 2 (34)

Open Access Article

1 - Parametric Investigation of Lerner Index in the Bank Deposits and Loan Market Using the Translog Cost Function
mahdi moradi Farhad Khodadad Kashi Jahangir Biabani Hadi Ghafari

The aim of this paper is to investigate the monopolistic power of Iran’s banking industry by parametric approach. For this purpose, the Lerner index was calculated in the bank deposits and loan markets using the Translog stochastic frontier cost function and using More

The aim of this paper is to investigate the monopolistic power of Iran’s banking industry by parametric approach. For this purpose, the Lerner index was calculated in the bank deposits and loan markets using the Translog stochastic frontier cost function and using banking data including balance sheet and profit and loss statement of 33 banks during 2001-2014. The results showed that monopolistic power of banking industry in the loan market has decreased over time and competitive conditions somewhat have been improved, so that the Lerner index for loan market in 1380 has been decreased from 0.77 to 0.54 in 1393. However, the gap between price and marginal cost is rather high level. Also, the Lerner index of deposit market has been fluctuated between 0.5 and 0.33. Manuscript profile

Open Access Article

2 - Pricing Model of National Gas Exports via Pipeline on the Base of Game Theory
Ali Akbar Naji Meidani Gholam Ali Rahimi

One of the most important issues in the field of natural gas export via pipeline is the lack of pricing strategy, and providing an optimum pricing mechanism has always been one of the biggest challenges for gas export contracts. In this paper a pricing mechanism based o More

One of the most important issues in the field of natural gas export via pipeline is the lack of pricing strategy, and providing an optimum pricing mechanism has always been one of the biggest challenges for gas export contracts. In this paper a pricing mechanism based on Game theory provided. The pricing mechanism has been developed based on cooperation among producing countries, consumers and gas transmitters that in the case of gas-exporting countries' commitment to it, the interests of these countries will be supplied. So, taking into account the realities of the market and according to the conditions of transmitter country, different scenarios have been compiled and according to it, the modeling is accomplished. The results of the different models in determining price, quantity and optimum tariff for two cooperative and non-cooperative games is that the interest of member countries in cooperative game is far greater than non-cooperative game. Manuscript profile

Open Access Article

3 - Geographical Aggregation of Industrial Activities and Productivity Growth: The Evidence from Iran's Provinces Manufacturing Industries
Morteza Sameti mahdi fathabadi Homayoun Ranjbar

This paper investigates the impact of spatial aggregation of industrial activities on manufacturing industries productivity growth of Iran's provinces during 2004-2013, using cross-section data and dynamic pooled regression by Generalized Method of Moments (GM More

This paper investigates the impact of spatial aggregation of industrial activities on manufacturing industries productivity growth of Iran's provinces during 2004-2013, using cross-section data and dynamic pooled regression by Generalized Method of Moments (GMM). To measure industrial aggregation Ellison Glaeser (EG) index was used. The findings support the “Williamson hypothesis”, that is, aggregation of industrial activities has positive effect on productivity growth only up to a certain level of development. By improving infastructures and markets expand, congestion externalities vary in the development phases and it can result in more dispersion in economic activities. Namely, aggregation accumulates human and physical capital and this accelerates economic growth. Manuscript profile

Open Access Article

4 - The Impact of Provincial Budget Gap on Regional Income Disparity of Iran’s Provinces by Using PVAR Model
Hadi Rahmani Fazli Abbas Arab Mazar

This paper attempts to investigate the relationship among provincial construction and total budget gap with per capita income disparity as a regional inequality index among the nation provinces during 2006 - 2011 periods by using panel vector autoregressive approach. Ba More

This paper attempts to investigate the relationship among provincial construction and total budget gap with per capita income disparity as a regional inequality index among the nation provinces during 2006 - 2011 periods by using panel vector autoregressive approach. Based on the panel co-integration test there is a long run significant relationship among provincial income per capita disparity with provincial construction and total budget gap. Estimation results of PVAR model and analysis of impulse responses functions show that the budget gap shock has a positive impact on income per capita disparity and justifying the shock effect on income per capita lasts about six periods. The variance decomposition results of the shocks showed that the total and construction budget gap explain a considerable part of provincial income per capita disparity variation. The results emphasis on necessary to reduction gap in budget allocation to the nation provinces. Manuscript profile

Open Access Article

5 - The Use of an Endogenous Growth Model to Calculate the Optimal Rate of Value Added Tax with Emphasis on Harmful Products and Waste
Ahmad Jafari Samimi Saeed Karimi Potanlar Kooroush Azami

The aim of this paper is to calculate the optimal rate of value added tax with emphasis on harmful products and waste and oil revenues using a model of endogenous growth for Iran’s economy. For this purpose, at first, a generalized growth model for three parts inc More

The aim of this paper is to calculate the optimal rate of value added tax with emphasis on harmful products and waste and oil revenues using a model of endogenous growth for Iran’s economy. For this purpose, at first, a generalized growth model for three parts including households, firms and government developed. After developing the model and achieving a determiner relationship of the optimal rate of value added tax, using the parameters of Iran’s economy, the model was calibrated and tax optimized values for different scenarios were calculated. The results showed that in the face of declining oil revenues, to remain in a constant situation, optimal rate of value added tax will be increased. More economic growth will increase the tax optimal rate. By increasing social sensitivity to the harmful products and waste, in order to provide optimum conditions for social welfare, the optimal rate of value added tax should be increased.   Manuscript profile

Open Access Article

6 - The Effective Factors on Iran's Tea Supply (Case Study: Gilan Province)
Mahsa Lobabi Mirghavami shahriar nessabian saeed yazdani

The purpose of this paper is estimation of the effective factors on tea supply in Gilan province by using time series data during 1981-2011 in the form of nerlove model. According to the results, explanatory variables of the model could describe 97 percent of dependent More

The purpose of this paper is estimation of the effective factors on tea supply in Gilan province by using time series data during 1981-2011 in the form of nerlove model. According to the results, explanatory variables of the model could describe 97 percent of dependent variable (product supply) changes. The results show that the guaranteed price index of green tea leaf with elasticity 0.81 has more sensitive. In addition, tea supply with a lag and having elasticity 0.60, as well as, technology with elasticity 0.14 are the most effective factors on tea supply. Due to the elasticity coefficient of tea imports and the amount of rainfall, which are -0.024 and 0.029 respectively, these two variables did not affect the tea supply significantly. Manuscript profile

Open Access Article

7 - Impact of Technological Progress and Efficiency Changes on the Productivity Growth of Iran Agriculture Sector: Data Envelopment Analysis
mahdi salarieh Amir Mohamadi Nejad Reza Moghaddasi

The aim of this paper is to study the impact of technological progress and efficiency changes on the productivity growth of Iran agriculture sector by separated provinces.So, by using Data Envelopment Analysis and Malmquist model, the impacts of technological and effici More

The aim of this paper is to study the impact of technological progress and efficiency changes on the productivity growth of Iran agriculture sector by separated provinces.So, by using Data Envelopment Analysis and Malmquist model, the impacts of technological and efficiency changes during 2005-2014 have been investigated. The results show that efficiency changes on the productivity growth has dominant role and technological changes share is less. The findings, also, showed that the impact of labor changes has a positive impact on productivity growth while capital changes have a negligible impact on the factors of production productivity.  Manuscript profile

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