List of Articles Market Structure

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  1 - Investigating the Comparative Advantage of Raisin in Province Zanjan and Determining Domestic Market Structure for it
  Dina Rajaei Ghazilou Yadollah Rajaei Karim Emami Joz
  In this research we are investigating the potentials of raisin production in Zanjan province of Iran. We applied PAM matrix, RCA and HHI indices to identify the domestic market structure and to see whether Zanjan has comparative advantage in production of raisin. We&nbs More

  In this research we are investigating the potentials of raisin production in Zanjan province of Iran. We applied PAM matrix, RCA and HHI indices to identify the domestic market structure and to see whether Zanjan has comparative advantage in production of raisin. We    used both mailed questionnaires and information provided by FAO and our results confirmed that government subsidies are important elements in this market. Manuscript profile
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  2 - Market Structure and Social Costs in Cement Industry: The Case study of Iran
  سید شمس الدین حسینی سمیه دودانگه
  This paper aims to highlight the structure of cement market in Iran and show how it has performed in the past, particularly over period of 2000 - 2007. Following the new policy guidelines notified by the supreme leader of Iran, I republic, pertaining the article 44 of T More

  This paper aims to highlight the structure of cement market in Iran and show how it has performed in the past, particularly over period of 2000 - 2007. Following the new policy guidelines notified by the supreme leader of Iran, I republic, pertaining the article 44 of The Constitution, it deemed necessary to carry out studies evaluating the viability these corporation exposed to market forces. The rationale behind  this new policy was to expedite the divestment process of state owned corporations to private entities as a step to enhance an environment of competitiveness in the economy, and also to promote productivity , social welfare and so forth,   As such, this study aims to fill this gap. To delineate the structure of Cement market, techniques such as Concentration index, Hirfindal-Hirshman index, and Entropy (both cases of including not including ownership effect) indexes are used. In the case Entropy including ownership effect, the result shows that over the period under study, the concentration ratio of top four firms were between 74 and 84 percent, and that of Herfindhal-Hirshman index was between 2018 and 2501 unit and Entropy index was between 0.74 and 0.83. In the case Entropy excluding ownership effect, the above observation can not be maintained. To measure social cost inflicted by Cement Industry Activities, Cowling-Mueller Method, was used. Cost function for cement industry (comprising of 10 firms) was estimated in an Integral Data Pattern Format using data covering the period of 2000 to 2007. Then, based on the information, the total cost of above mentioned firms, their price deviation from total cost, and the total welfare costs of the industry as a whole were calculated. The results of above calculations show that the welfare loss resulted from monopoly of these 10 firms, amounts to 44 percent of sale value. Moreover, economics of scale was taken care of while estimating marginal cost and average cost in this industry.   Manuscript profile
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  3 - The Effect of Changes in the Banking Industry Structure on Firms Investment
  ebrahim abdi Farhad khodadad kashi Yeganeh Mosavi Jahromi
  This Study examines the impact of structural changes in the banking industry on firms investment listed on the Tehran Stock Exchange. For this purpose, data from 258 firms during the period from 2005 to 2014 and the dynamic generalized method of moments were utilized to More

  This Study examines the impact of structural changes in the banking industry on firms investment listed on the Tehran Stock Exchange. For this purpose, data from 258 firms during the period from 2005 to 2014 and the dynamic generalized method of moments were utilized to put forward an investment model with financial constraints. The results of the study showed that these firms faced a financial constraints on investment and Concentration in the banking industry has affected the investment of the firms by reducing the financial constraints. The results also revealed that small firms have experienced greater financial constraints in comparison with larger firms and Larger firms have gained more benefits from concentration in the banking industry. Manuscript profile
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  4 - Estimating the market power of the insurance industry in Iran using the Hall-Roger approach (during the period 1380-1399)
  Jafar Yousefi Mehdi Moradi Yousof HajiAsghari Rostam Garadagi
  10.30495/eco.2023.1978230.2725
  Estimating the amount of market power and determining the market structure of various industries is one of the most important topics in microeconomics,because the amount of production and price of various goods and services is affected by the degree of monopoly and mark More

  Estimating the amount of market power and determining the market structure of various industries is one of the most important topics in microeconomics,because the amount of production and price of various goods and services is affected by the degree of monopoly and market power of that industry.The purpose of this research is to estimate the degree of agreement and the levelof market power of the insurance industry using the Hall-Roger approach in the form of supply and demand equations with the help ofpanel data using the two-stage least squares method.For this purpose,the information of27public and private insurance companies In addition to the large share of their financial market in employment, the insurance industry is closely related to the characteristics of savings and the level of economic development of countries, and as one of the tools of risk management, it provides the expansion of social welfare on the one hand, and on the other hand It leads to the growth of investment and, as a result, more production and economic prosperity.As expected,the research results indicate the mutual dependence of insurance industry companiesSo that more than 85%of the investigated insurance companies have been able to enjoy a significant profit margin by creating a gap between the price and the final cost.Also the calculation results related to theLerner index based on theHall model show the information related to the coefficient of heterogeneity among insurance companies.Iran insurance has the highest Lerner index with a coefficient of0.565andAsia,Dana andPasargad insurances are in the next ranks with0.419,0.248and0.182respectively, Manuscript profile
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  5 - Investigating Impact of Market Structure and Asymmetric Information on Performance of Active Firms on the Tehran Stock Exchange in a Dynamic Model
  Monir Sadat MirjamaliMehrabadi Abbas Najafizadeh Majid Zanjirdar Peyman GhafariAshtiani
  10.30495/fed.2022.697606
  AbstractIn the stock market, information plays an important role, if there is information asymmetry in market, maybe over time, the market moves toward incomplete competition models. The Tehran Stock Exchange, as the largest and most integrated part of the Iran capital More

  AbstractIn the stock market, information plays an important role, if there is information asymmetry in market, maybe over time, the market moves toward incomplete competition models. The Tehran Stock Exchange, as the largest and most integrated part of the Iran capital market, does not have much history and as a result, several factors affect the activities of this market. Therefore, in this study, we investigate the factors affecting the performance of these firms. For this purpose, the 40 active firms in the Tehran Stock Exchange whose data are available are considered. The required data of the study were collected from the Tehran Stock Exchange site, the Rahavard Novin software and balance sheets of these firms during the period of 2008-2018 and models are estimated using with STATA 14. The performance variable in this study has three proxies including ROA, ROE and EBT indexes. The data analysis was done with GMM Dynamic Panel. Two main variables of market structure and asymmetric information are examined. The results show that the former have a direct relationship and the later have an inverse relationship with firm performance. The results also indicate that the information asymmetry trend is increasing and monopolistic competition is the best description of the degree of competition among the active firms of the Tehran Stock Exchange.   Manuscript profile
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  6 - Evaluating the Effect of Asymmetric Information and Scale Effect on Market Structure in Tehran Stock Exchange
  monir sadat mirjamali mehrabadi abbas najafizadeh majid zanjirdar peyman ghafari ashtiani
  Role of information in economy started from questioning one of the assumptions of perfect competition theory in market. In stock market, information plays an important role in determining the level of competitiveness. In this study tried to measure the competitiveness o More

  Role of information in economy started from questioning one of the assumptions of perfect competition theory in market. In stock market, information plays an important role in determining the level of competitiveness. In this study tried to measure the competitiveness of firms in Tehran Stock Exchange by using income equations in the presence of asymmetric information. In this regard, first, using the income equations and a GLS- Panel has been paid the effect of various variables. The results indicate that equations without the effect of scale offer better specification of the firms’ conditions. Although asymmetric information is high in stock market and stock gains influenced by the degree of asymmetric information, but extent of this influence is limited. The “H competitiveness index” shows that monopolistic competition is best description of market conditions in equations of incomes from changes in stock prices, but in equations of incomes from stocks dividends and accumulated, the performance of studied firms be explained with monopolistic behavior. Manuscript profile