نتایج جستجو برای: herfindahl and hirschman index
تعداد نتایج: 16866031 فیلتر نتایج به سال:
The CR4 Index and the Interval Estimation of the Herfindahl-Hirschman Index: An Empirical Comparison
این مقاله تلاش دارد تا پاسخ مناسبی برای این پرسش که ساختار بازار محصول شرکت‌های صاحبکار چه تأثیری بر هزینه های حسابرسی دارد را پیدا نماید. از شرکت‌های پذیرفته شده در بورس اوراق بهادار تهران به عنوان جامعه آماری تحقیق استفاده گردید. حق الزحمه حسابرسی به عنوان شاخص هزینه های حسابرسی به عنوان متغیر وابسته تحقیق و معیارهای ساختار بازار محصول شامل شاخص هرفیندال– هیرشمن، شاخص لرنرو شاخص لرنر تعدیل ش...
Many risk, inequality, poverty and concentration measures are extremely sensitive to outliers, dependence, heterogeneity and heavy tails. In this paper we focus on robust measurement of risk, inequality, poverty and concentration under heterogeneity, dependence and heavy-tailedness of largely unknown form using the recent results on t−statistic based heterogeneity and correlation robust inferen...
BACKGROUND AND OBJECTIVE The efficiency and function of the pharmaceutical sector, as a vital portion of the health system, have a significant effect on intermediate and final indices of health. In this research, the structure of the pharmaceutical market in Iran was examined through the calculation of concentration indices in 2011. METHODS In this cross-sectional study, the needed data was g...
This article tries to survey the structure of Iran’s banking industry during the period 2001-2008. The survey has been conducted on the basis of two concentration indicators, namely, Herfindahl-Hirschman Index (HHI) and Concentration Ratio (CRk). The results of the study show that concentration has undergone a decreasing trend in Iran’s banking industry market. The main cause of such a trend is...
This paper investigates the pricing of patented traits in the U.S. hybrid corn seed market under imperfect competition. In a multiproduct context, we first examine how substitution/complementarity relationships among products can affect pricing. This is used to motivate multi-product generalizations of the Herfindahl-Hirschman index (GHHI) capturing cross-market effects of imperfect competition...
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