آزمون وجود انحصار طبیعی در صنعت توزیع برق ایران: یک تجزیه و تحلیل پانلی با ضرایب تصادفی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری اقتصاد دانشگاه شیراز

2 دانشیار اقتصاد دانشگاه شیراز

3 استادیار ریاضی دانشگاه شیراز

چکیده

انحصار طبیعی در اقتصاد به شرایطی گفته می‌شود که تولید یک بنگاه در یک صنعت، سودآورتر از تولید بیش از یک بنگاه در آن صنعت باشد. این مفهوم در صنایعی مانند توزیع برق، توزیع گاز، مخابرات و توزیع آب که در کشورهای مختلف تحت تنظیم مقررات قیمتی و غیرقیمتی قرار می‎گیرند، اهمیت بیشتری دارد. در این مطالعه ساختار انحصار طبیعی در شرکت‌های توزیع برق ایران مورد بررسی قرار گرفته است. بنابراین یک تابع هزینه با فرم ترانسلوگ بکار گرفته شد. در این تابع، قیمت نسبی سرمایه و قیمت نسبی سایر نهاده‌های تولیدی به عنوان بردار قیمت نهاده‌ها، و مقدار برق توزیع شده نیز به عنوان ستاده انتخاب شد. به منظور برآورد تقریب درجه دوم از تابع هزینه ترانسلوگ، از مدل ضرایب تصادفی در داده‌های پانلی و داده‌های دوره زمانی 1383 تا 1393 استفاده شد. نتایج این مطالعه نشان داد که برخی از شرکت‌های توزیع برق ایران با شرایط انحصار طبیعی مواجه بوده و برخی دیگر در سطوح مختلف تولید از این شرایط برخوردار نیستند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

A Test for Natural Monopoly in Iranian Electricity Distribution Industry: A Panel Random Coefficients Model Analysis

نویسندگان [English]

  • Sayed Mohamad Mirhashemi Dehnavi 1
  • Ahmad Sadraei Javaheri 2
  • Hossein Marzban 2
  • Sayed Morteza Mirdehghan 3
1 Ph.D. Candidate in Economics, Shiraz University,
2 Associate Professor of Economics, Shiraz University
3 Associate Professor of Mathematics, Shiraz University
چکیده [English]

In economics, natural monopoly is described as a situation in which, for structural reasons, only one firm finds it profitable to produce in the market. This Concept is more important and more practical in Industries that faced price and non-price regulation such as water, gas and electricity distribution and telecommunication. In this study natural monopoly structure in Iranian electricity distribution was investigated. To this, a Translog cost function was employed. Relative capital price, relative other input price and customer electricity sales were assumed as input price vector and output, respectively. In order to estimate the second order approximation of Translog cost function, the random coefficient model in panel data and the data of 2004 till 2014 were used. The results showed the existence of natural monopoly in some companies in contrast to other.

کلیدواژه‌ها [English]

  • Natural monopoly
  • Economies of scale. Iranian electricity distribution companies
  • Translog cost function
  • Random coefficient model in panel data
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