Is Middle East and North Africa different? A comparative analysis of growth and structural change in and outside MENA

2016 ◽  
Vol 8 (2) ◽  
pp. 177-197
Author(s):  
Nicet-Chenaf Dalila ◽  
Rougier Eric
2018 ◽  
Author(s):  
Ashraf Farahat

Abstract. Comparative analysis of MISR MODIS, and AERONET AOD products performed over seven AERONET stations located in the Middle East and North Africa for the period of 2000–2015. Sites are categorized into dust, biomass burning and mixed. MISR and MODIS AODs agree during high dust seasons but MODIS tends to underestimate AODs during low dust seasons. Over dust dominating sites, MODIS/Terra AOD indicate a negative trend over the time series, while MODIS/Aqua, MISR, and AERONET depict a positive trend. A deviation between MODIS/Aqua and MODIS/Terra was observed regardless of the geographic location and data sampling. The performance of MODIS is similar over all region with ~ 68 % of AODs within the Δτ = ±0.05 ± 0.15τAERO confidence range. MISR AOD retrievals fall within 72 % of the same confidence range for all sites examined here. Both MISR and MODIS capture aerosol climatology; however few cases were observed where one of the two sensors better captures the climatology over a certain location or AOD range than the other sensor.


2019 ◽  
Vol 31 (4) ◽  
pp. 646-671 ◽  
Author(s):  
Nizar Mohammad Alsharari

Purpose The purpose of this paper is to gain insight into how well past reforms have performed against revenue, equity and efficiency benchmarks of tax policymaking, so that the direction of future reform of tax system might be determined. It also presents a comparative analysis of taxation and revenue trends in the Middle East and North Africa (MENA) region over the data set period 1990-2012. Design/methodology/approach By overviewing the development and relative significance of resource revenues, allocating non-resource taxes and examining the tax policies of constituent countries, this paper presents a comparative review of taxation and revenue trends in the MENA region. Findings Findings showed, on average, a slight decline in non-resource revenues against the significant rise in income from resources. The analysis of government revenues and current taxation structures provide insight into how prior reforms have performed against the standard measures of tax policy-making (i.e. revenue, equity and efficiency) and directions for change leading to the establishment of simple tax systems. The study observes regional differences, such as the higher tax and revenues of the Maghreb sub-region over the Mashreq, except for value-added tax, where low rates were associated with equal or greater revenue. Similarities were also found, including the partial compensation by income taxes (not indirect taxes) for revenue lost through trade liberalization. The challenges of tax reform are found to vary across countries and opportunities for improving equity and reducing the complexity of tax systems across the region are identified. Research limitations/implications Reforms in all tax systems could have major implications for the country, employment, earnings and tax revenues; but recommendations would require political value judgments and government decisions. The study suggests eliminating the current tax system, thereby replacing one of the more distortionary taxes in the current system with a neutral and efficient tax. Originality/value The paper signals the need, even of the oil-rich states of the Gulf Cooperation Council, for governments to build tax systems capable of capturing and spending revenues effectively into the future.


2019 ◽  
Vol 37 (1) ◽  
pp. 49-64 ◽  
Author(s):  
Ashraf Farahat

Abstract. Comparative analysis of Multi-angle Imaging SpectroRadiometer (MISR), Moderate Resolution Imaging Spectroradiometer (MODIS), and Aerosol Robotic Network (AERONET) aerosol optical depth (AOD) products is performed over seven AERONET stations located in the Middle East and North Africa for the period of 2000–2015. Sites are categorized into dust, biomass burning, and mixed aerosol conditions. MISR and MODIS AOD agree during high-dust seasons but MODIS tends to underestimate AOD during low-dust seasons. Over dust-dominated sites, MODIS/Terra AODs indicate a negative trend over time, while MODIS/Aqua, MISR, and AERONET depict a positive trend. A deviation between MODIS/Aqua and MODIS/Terra was observed regardless of the geographic location and data sampling. The performance of MODIS is similar over the entire region with ∼64 % of AOD within the Δτ=±0.05±0.15τAERO confidence range. MISR AOD retrievals fall within 84 % of the same confidence range for all sites examined here. Both MISR and MODIS capture aerosol climatology; however few cases were observed where one of the two sensors better captures the climatology over a certain location or AOD range than the other sensor. AERONET Level 2.0 version 3, MODIS Collection 6.1, and MISR V23 data have been used in analyzing the results presented in this study.


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