this paper studies the effects of six factors including industry type, size, age, ratio of capital to total assets, ratio of debts to assets, and advertising costs on profitability of com companies accepted in tse. profitability is defined at the three standard levels of roa, roat, and roe. the sample used in this research belong to the companies which are accepted in tse vy feb. 2001, and they...

It is now well established that the volatility of asset returns is time varying and highly persistent. One leading model that is used to represent these features of the data is the stochastic volatility model. The researcher may test for non-stationarity of the volatility process by testing for a unit root in the log-squared time series. This strategy for inference has many advantages, but is n...

After the collapse of the housing bubble in 2007, severe fire sales of assets in the financial sector are accompanied by a rise in the volatility of asset returns in the non-financial firms. To account for their co-movements, I develop a model that highlights the interaction between the financial health of the banking sector and the volatility of asset returns. The novel feature of the model is...

We establish several new findings on the relation between open interest in commodity markets and asset returns. High commodity market activity, as measured by high open-interest growth, predicts high commodity returns and low bond returns. Openinterest growth is a more powerful and robust predictor of commodity returns than other known predictors such as the short rate, the yield spread, the ba...

The design of a credit risk measurement model in the monetary and banking system will play an important role in increasing the profitability of banking resources. This article attempts to use two models of Logit and Z Altman to determine and predict the credit risk of facilities provided to legal entities at a private bank in Iran. The variables studied in this research include qualitative vari...

We seek to determine the optimal amount of the insurer’s investment in all types of assets for a small and closed economy. The goal is to detect the implications and contributions the risk seeker and risk aversion insurer commonly make and the effectiveness in the investment decision. Also, finding the optimum portfolio for each is the main goal of the present study. To this end, we adopted the...