scholarly journals Russian Market Power in International Wheat Exports: Evidence from a Residual Demand Elasticity Analysis

2018 ◽  
Vol 17 (2) ◽  
Author(s):  
Kerstin Marit Uhl ◽  
Oleksandr Perekhozhuk ◽  
Thomas Glauben
Keyword(s):  
Market Power ◽  
Demand Elasticity ◽  
North African ◽  
African Region ◽  
Export Markets ◽  
Russian Market ◽  
Market Shares ◽  
Residual Demand ◽  
Dominant Market Position ◽  
Residual Demand Elasticity

Abstract Russia has emerged as a major wheat exporter since the beginning of the 2000s, and today, it possesses high market shares in several wheat-importing countries in the Middle East and North African region. This has raised concerns that Russia might abuse its dominant market position by pricing above marginal cost. Using a novel dataset with weekly information on Russian wheat exports, we apply the residual demand elasticity method to analyze the pricing behavior of Russia in its two most important export markets, i. e. Egypt and Turkey. Our estimation results reveal that Russia behaves competitively in Egypt while it exerts market power in Turkey with an estimated mark-up of 13.5 %.

scholarly journals IMPERFECT COMPETITION IN CHINA'S IMPORT MARKET OF ROUNDWOOD AND LUMBER PRODUCTS

2018 ◽  
Vol 50 (2) ◽  
pp. 149-168 ◽  
Author(s):  
CHANGYOU SUN ◽  
XIAOPING ZHOU
Keyword(s):  
Market Power ◽  
Imperfect Competition ◽  
Demand Elasticity ◽  
Distributed Lag ◽  
Distributed Lag Model ◽  
Autoregressive Distributed Lag ◽  
Residual Demand ◽  
Lag Model ◽  
Trading Volumes ◽  
Residual Demand Elasticity

AbstractChina has become the largest importer of roundwood and lumber products in recent years. In this study, the degree of competition among major supplying countries in China's import market is measured through the inverse residual demand elasticity over 1995–2015. Time-series properties of the data are considered through the autoregressive distributed lag model. The analysis reveals that market power exists in roundwood and lumber markets for a few supplying countries. The suppliers in the lumber import market have more market power than those in the roundwood market. Individual countries with substantial market power have more fluctuations in trading volumes.

Genetic diversity and structure of a barley collection predominatly from North African region

2021 ◽  
Author(s):  
Solange Nyiraguhirwa ◽  
Zahra Grana ◽  
Fatima Henkrar ◽  
Hassan Ouabbou ◽  
Ibriz Mohammed ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
North African ◽  
African Region ◽  
Genetic Diversity And Structure

scholarly journals Climatology of Medium-Scale Traveling Ionospheric Disturbances (MSTIDs) Observed with GPS Networks in the North African Region

2020 ◽  
Author(s):  
Temitope Seun Oluwadare ◽  
Norbert Jakowski ◽  
Cesar E. Valladares ◽  
Andrew Oke-Ovie Akala ◽  
Oladipo E. Abe ◽  
...  
Keyword(s):  
Gravity Waves ◽  
Occurrence Rate ◽  
Ionospheric Disturbances ◽  
North African ◽  
African Region ◽  
Atmospheric Gravity Waves ◽  
Medium Scale ◽  
Traveling Ionospheric Disturbances ◽  
The North ◽  
Atmospheric Gravity

Abstract We present for the first time the climatology of medium-scale traveling ionospheric disturbances (MSTIDs) by using Global Positioning System (GPS) receiver networks on geomagnetically quiet days (Kp ≤ 3) over the North African region during 2008-2016. The MSTIDs appear frequently as oscillating waves or wave-like structures in electron density induced by the passage of Atmospheric Gravity Waves (AGW) propagating through the neutral atmosphere and consequently, causing fluctuation in the ionospheric Total Electron Content (TEC). The TEC perturbations (dTEC) data are derived from dual frequency GPS-measurements. We have statistically analyzed the MSTIDs characteristics, occurrence rate, seasonal behavior as well as the interannual dependence. The results show a local and seasonal dependence of nighttime and daytime MSTIDs. The propagation direction is predominantly towards the South (equatorward), MSTIDs event period is (12 ≤ period ≤ 53 mins), and dominant amplitude (0.08 ≤ amp ≤ ~1.5 TECU), with a propagation velocity higher at daytime than nighttime. The amplitudes of the MSTIDs increase with solar activity. The local MSTIDs Spatio-temporal heat reveals variability in disturbance occurrence time, but seems to be dominant within the hours of (Northwest: 1200–1600 LT) and (Northeast: 1000–1400 LT) in December solstice during daytime, and around (NW: 2100–0200 LT) and (NE: 1900–0200 LT) in June solstice, but get extended to March equinox during solar maximum (2014) during the nighttime. The time series of MSTIDs regional distribution map is also generated. Atmospheric gravity waves (AGW) seems to be responsible for the daytime MSTIDs occurrence.

scholarly journals Enteric Fever in Mediterranean North Africa

2009 ◽  
Vol 3 (10) ◽  
pp. 753-761 ◽  
Author(s):  
Khalifa Sifaw Ghenghesh ◽  
Ezzedin Franka ◽  
Khaled Tawil ◽  
Momtaz Wasfy ◽  
Salwa F. Ahmed ◽  
...  
Keyword(s):  
North Africa ◽  
Salmonella Enterica ◽  
Enteric Fever ◽  
Salmonella Typhi ◽  
Multidrug Resistant ◽  
Population Based ◽  
North African ◽  
African Region ◽  
African Countries ◽  
The Mediterranean

Typhoid fever is endemic in the Mediterranean North African countries (Morocco, Algeria, Tunisia, Libya, and Egypt) with an estimated incidence of 10-100 cases per 100,000 persons. Outbreaks caused by Salmonella enterica serovar Typhi are common and mainly due to the consumption of untreated or sewage-contaminated water. Salmonella enterica Paratyphi B is more commonly involved in nosocomial cases of enteric fever in North Africa than expected and leads to high mortality rates among infants with congenital anomalies. Prevalence among travellers returning from this region is low, with an estimate of less than one per 100,000. Although multidrug resistant strains of Salmonella Typhi and Paratyphi are prevalent in this region, the re-emergence of chloramphenicol- and ampicillin-susceptible strains has been observed. In order to better understand the epidemiology of enteric fever in the Mediterranean North African region, population-based studies are needed. These will assist the health authorities in the region in preventing and controlling this important disease.

The OSCE and the Middle East and North African region: Not so fast?

2012 ◽  
Vol 23 (3) ◽  
pp. 191-197
Author(s):  
Nathalie Tagwerker ◽  
Ruben-Erik Diaz-Plaja ◽  
Bernhard Knoll
Keyword(s):  
Middle East ◽  
North African ◽  
African Region
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