the conflict between investors' interests and managers is an important issue which has been attracted researchers attentions in last decade. according to the related literature, corporate governance body of research has offered alternatives for solving this problem such as ownership structure. this research investigates the effect of ownership structure on firm performance. the factors whi...

The purpose of this paper is examining the impact of financial leverage as a mediation variable on the relationship between ownership concentration and financial corporate performance. To test the hypotheses, multiple regression analysis is used. The statistical population of this research is all listed companies in Tehran Stock Exchange. However, data were available only for 60 companies durin...

A common sales tactic is for a seller to encourage a potential customer to make her purchase decision quickly. We consider a market with sequential consumer search in which firms often encourage first-time visitors to buy immediately, either by making an “exploding offer” (which permits no return once the consumer leaves) or by offering a “buy-now discount” (which makes the price paid for immed...

journal of accounting advances (j.a.a) vol. 2, no. 2, fall & winter 2010, ser. 59/3     extended abstract   an investigation of agency theory and signaling theory in dividend policies: the role of institutional investors   dr. g. r. karami         dr. s. mehrani               h. eskandar tehran university   introduction        dividend has a special position among decision makers. dividend poli...

All resources need to be managed to realize opportunities. Isolating the benefits of Information Technology and relating them to the associated costs has proved elusive and threatened emerging opportunities. A change of approach has been advocated to overcome these problems which focuses on the Total Cost of Ownership. Over the past several years, the Total Cost of Ownership has been both haile...

For a nonautonomous discrete SIQR model, we obtain conditions for permanence and extinction of the disease and we establish the global asymptotical stability when our conditions determine extinction. We also discuss the particular autonomous and periodic situations, where our conditions are sharp thresholds between permanence and extinction of the disease. AMS Subject Classifications: 92D30, 37...

In this paper, we derive some threshold conditions for permanence and extinction of diseases that can be described by a nonautonomous SEIRS epidemic model. Under the quite weak assumptions, we establish some sufficient conditions to prove the permanence and extinction of disease. Some new threshold values are determined.

Purchasing and supply leaders continually search for ways to improve the quality, delivery, and cost of production inputs. Their participation in these proactive supply chain activities can be a significant driver of purchasing and supply management’s use of information technology (IT). Using a transaction cost analysis perspective, we surveyed purchasing and supply professionals at the directo...

Critics of current tying doctrine argue that metering ties can increase consumer welfare and total welfare without increasing output and that they generally increase both welfare measures. Contrary to those claims, we prove that metering ties always lower both consumer welfare and total welfare unless they increase capital good output. We further show that under market conditions we argue are r...