Madjid Hatefi Madjumerd; gholamreza zamanian; Mohammad Nabi Shahiki Tash
Abstract
The present study aims to interpret equity premium puzzle based on the bubble risk approach in Iran’s securities market for the period 1996:09-2016:10. To this end, discovery of bubbles, estimation of the Epstein-Zin Preferences function, and interpretation of equity premium are examined. After ...
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The present study aims to interpret equity premium puzzle based on the bubble risk approach in Iran’s securities market for the period 1996:09-2016:10. To this end, discovery of bubbles, estimation of the Epstein-Zin Preferences function, and interpretation of equity premium are examined. After that, RTADF tests are used to discover bubbles and date their stamping. Research results indicate that the securities market has experienced six bubble periods and has not had bubble in 65 percent of the period. In addition, the Epstein- Zin Preferences function of this study is estimated using GMM method. In this stage, estimation of elasticity of intertemporal substitution parameter is very important since it is expected that the risk of bubble is used to describe a part of stock market’s risk. Results of the study indicate that market bubbles have boosted risk factors in the securities market. In addition, economic factors in the securities market of Iran are substantially risk averse. Findings show that based on the traditional approach, a comprehensive interpretation of equity premium puzzle could not be presented; while the new approach can ascertain 90 percent of equity premium.
Mohammad Nabi Shahiki Tash; Javad Taherpoor; Ali Nourozi
Abstract
In this study, by employing a flexible cost function we calculate the technological change measure and total factor productivity and examine the impact of technology on the combination of input and scale of production in Iranian manufacturing industries. According to the results of technological change ...
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In this study, by employing a flexible cost function we calculate the technological change measure and total factor productivity and examine the impact of technology on the combination of input and scale of production in Iranian manufacturing industries. According to the results of technological change at the average data level, total production cost of industry has decreased by an amount of 0.49 percent during the period 1996-2009. All 23 studied industries have deviation from input technology. In addition, technological change has led to saving in raw materials and to an increase in the use of three inputs of labor, capital, and energy. The technological change is non-neutral and has led to changes in production scale and based on the technology scale bias, technological change has led to a decrease in optimal production scale.
Mohammad Nabi Shahiki Tash; Ali Norouzi
Volume 19, Issue 58 , April 2014, , Pages 39-76
Abstract
The objective of this paper is to estimate and analyze market power and degree of concentration in Iran's Manufacturing industries. The paper employs Inter-industry Variability function of profit margin approach and U-Davies in order to evaluate degree of industrial concentration. The finding indicates ...
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The objective of this paper is to estimate and analyze market power and degree of concentration in Iran's Manufacturing industries. The paper employs Inter-industry Variability function of profit margin approach and U-Davies in order to evaluate degree of industrial concentration. The finding indicates that elasticity of inequality distribution for market share in the industries is less than 0.5 and therefore it is understood that the market share of the industry is almost sensitive relative to the new entry firms. The results also demonstrate that the average value of the U-Davies concentration index for the manufacturing industries is 0.038, so that the manufacturing of tobacco products with 0.616 and manufacturing of plastic products along with manufacturing of other non-metallic mineral products have had the highest and lowest levels of concentration index respectively.
Farhad Khodadad Kashi; Mohammadnabi Shahekitash
Volume 17, Issue 51 , July 2012, , Pages 21-42
Abstract
This paper aims to examine the relationship between the structural and performance variables in 140 Iranian industries, besides investigating structure of industrial markets according to the Four-firm concentration ratio plus cost advantage ratio (CDR). Then the study estimates efficiency level of the ...
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This paper aims to examine the relationship between the structural and performance variables in 140 Iranian industries, besides investigating structure of industrial markets according to the Four-firm concentration ratio plus cost advantage ratio (CDR). Then the study estimates efficiency level of the industries under the stochastic frontier technique in 4 digits ISIC code so that finally the relationship between the structure and performance based on the SCP pattern has been examined through the estimated efficiency level. Additionally, we applied the bootstrap approach in order to have more precise judgment on the gained results. The findings indicate that firstly the industries with high concentration intensity are more inefficient, in other words there is an adverse relationship between the monopoly power and efficiency in Iranian industries which obviously imply that Unlike the Chicago notion, here the monopoly power does not originate from the efficiency, and we shall look for other possible reasons pertaining to this phenomena. Secondly, the industries with more intensity of entry barrier are more inefficient, it means that the role of entry barrier due to lack of competition is of significance in creating the inefficiency in the industrial sector. Thirdly, those industries which have more shares of governmental activities compared to private sector indicate lower efficiency. Which mean that there is a negative relationship between the government presence and efficiency of industrial activities.
Mohammadnabi Shahekitash; Nasim Fiyozi Ekhtiyari
Volume 13, Issue 38 , April 2009, , Pages 133-155
Abstract
"Competition" and "monopoly" are two important issues in market structure analysis. Theoretically, monopoly structure in an industry results in distorted resource allocation, bringing about economic rents. The outcome of such market structure is the burden of social costs imposed on the users. This study ...
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"Competition" and "monopoly" are two important issues in market structure analysis. Theoretically, monopoly structure in an industry results in distorted resource allocation, bringing about economic rents. The outcome of such market structure is the burden of social costs imposed on the users. This study shows that the insurance industry in Iran is a tight monopoly. We therefore, estimate the resulting social burden of insurance industry in Iran. The result of calculating Harberger, Posner, and Cowling-Muller indices in 2003 shows that a social cost is equal to 2.8%, 3.45%, and 3.13%. of the revenues earned in insurance industry, respectively.
