Forecasting in a risky situation is a very important function for managers to assist in decision making. One of the fluctuated markets in stock exchange market is chemical market. In this research the target item for prediction is PET (Poly Ethylene Terephthalate) which is the raw material for...

Nowadays, forecasting what will happen in economic environments plays a crucial role. We showed that in PET market how a neuro-fuzzy hybrid model can assist the managers in decision-making. In this research, the target is to forecast the same item through another intelligent tool which obeys the...

This study examines the random walk hypothesis for the crude oil markets, using daily data over the period 1982-2008. The weak-form efficient market hypothesis for two crude oil markets (UK Brent and US West Texas Intermediate) is tested with non-parametric variance ratio tests developed by...

This paper addresses the problem of transmission loss allocation in a power system where the generators, the demands and the system operator are independent. We suppose that the transmission losses are exclusively charged to the generators, which are willing to adopt a perfectly competitive...

This study examines the random walk hypothesis for the Shanghai and Shenzhen stock markets for both A and B shares, using daily data over the period 1992-2007. The hypothesis is tested with new multiple variance ratio tests - Whang-Kim subsampling and Kim's wild bootstrap tests - as well as the...

Share repurchases are transactions which are supposed to cause a market reaction through a signaling approach. However looking only at cumulated abnormal returns (CARs) is insufficient and the results are sometimes contradictory. We introduce the concept of informativeness to assess if...

Precious metals (gold, silver, and platinum) have become an important part of investment portfolios for individuals as well as for institutions. A key question is whether investors should actively trade these metals to time the market or whether they should take a buy-and-hold strategy. This...

The aim of this paper is to examine the positive and negative impacts of stock exchange mergers on the informational efficiency of the markets. We consider a range of factors in relation to the stock exchange merger, that can potentially affects market efficiency, after a merger. These factors...