University of Piraeus

About: University of Piraeus is a education organization based out in Piraeus, Attiki, Greece. It is known for research contribution in the topics: Context (language use) & Computer science. The organization has 1731 authors who have published 6209 publications receiving 106699 citations.

Market Shares and Concentration in the EU Auditing Industry: The Effects of Andersen's Demise

Abstract: This paper describes and analyses changes at the concentration level of the audit services markets in 15-EU member-countries. The sample consists of 2,862 clients of auditing firms for the period 1998 to 2004. The findings of the research show that concentration in the aggregate sample increased over time. Concentration in the audit markets of the EU-15 member-countries exhibits substantial variation across countries while average concentration, before and after Arthur Andersen’s dissolution, has increased in 12 and declined in three countries. Results segmented by economic sectors indicate that the concentration increased in all sectors except Energy, which is the sector with the highest concentration. Overall, the empirical results suggest that there are complexities in our understanding of auditing services markets for competition purposes.

Profilio Selection Using the Adelais Multiobjective Linear Programming System

Abstract: The ADELAIS (Aide a la DEcision pour systemes Lineaires multicriteres par AIde a la Structuration des preferences), multiobjective linear programming system is proposed as a decision tool for the selection of stock portfolios. A portfolio selection model is developed and applied to a set of fifty two stocks from the Athens Stock Exchange for the two years period of 1989–1990. On the basis of this model, ADELAIS is used to design and evaluate alternative portfolios by considering a set of well known criteria such as return, price earnings ratio, volume of transactions and dividend yield. A final portfolio of maximal utility is obtained as an outcome of an interactive process of individual inter-alternative preference modelling.

Measuring the market risk of freight rates: a value-at-risk approach

Abstract: The fluctuation of shipping freight rates (freight rate risk) is an important source of market risk for all participants in the freight markets including hedge funds, commodity and energy producers. We measure the freight rate risk by the Value-at-Risk (VaR) approach. A range of parametric and non-parametric VaR methods is applied to various popular freight markets for dry and wet cargoes. Backtesting is conducted in two stages by means of statistical tests and a subjective loss function that uses the Expected Shortfall, respectively. We find that the simplest non-parametric methods should be used to measure freight rate risk. In addition, freight rate risk is greater in the wet cargoes markets. The margins in the growing freight derivatives markets should be set accordingly.