This study examines the factors determining demand for imports of member countries Economic Community West African States (ECOWAS) over period from 1980 to 2017. As a modelling strategy, we employ Common Correlated Effect Mean Group (CCEMG) estimator that accounts both heterogeneity and cross-sectional dependence across countries. The provides various pieces evidence through whole-panel country...

This paper examines the empirical validity of a model of homogeneous input demand under price uncertainty in which firms trade off expected input cost against its variability (risk) in selecting the optimal input supplier mix. Using recent work in time-series econometrics, this model is applied to the Japanese steam-coal import market, where five suppliers compete: China, the Soviet Union, Sout...

This paper presents an application of Optimization (PSO) technique to estimate energy Turkey, based on economic indicators.The economic indicators that are used during the model development are: gross nationa product (GNP), population, import and export figures of Turkey. Energy demand and other economic indicators in Turkey from 1979 to 2005 are considered as the case of this study. The energy...

This study examines the effects of trade liberalization on the extensive and intensive margins of import and export in developing countries. The study use the duties and the trade liberalization dummy variable (the year which countries have significant reforms in trade policies) to represent trade liberalization. As a result, the study found that the trade liberalization has a significant impac...

In this paper, we provide a comprehensive multivariate cointegration analysis of three parts of the steam coal value chain – export, transport and import prices. The analysis is based on a rich dataset of international coal prices; in particular, we combine data on steam coal prices with freight rates, covering the period December 2001 until August 2009 at weekly frequency. We then test whether...

Characterization and evaluation of a biological submerged filter was carried out on a full-scale pilot plant performing removal of biochemical oxygen demand (BOD) and total nitrogen (TN) from pre-treated urban wastewater. The average influent values of BOD5, chemical oxygen demand (COD) and TN were 370, 1,015 and 60 mg/L, respectively. The pilot plant produced good discharge quality during stea...

according to amount of oil seeds import in iran are more than 80% of domestic needs, in this study, import comparative advantage in soybeans using rca and rsca index is calculated in 1961-2008 periods for iran and ten important importer countries. iran’s competition state is investigated. also long run relation between production and import comparative advantage index is estimated using johanse...