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. 2022 Nov 18;8(11):e11672.
doi: 10.1016/j.heliyon.2022.e11672. eCollection 2022 Nov.

Appraising the spillover effect of water use efficiency indicators in sub- Saharan Africa: A spatial econometric approach

Ethel Ansaah Addae  1 , Dongying Sun  1 , Olivier Joseph Abban  2 , Jeffery Fianko Addae  3
Affiliations

Appraising the spillover effect of water use efficiency indicators in sub- Saharan Africa: A spatial econometric approach

Ethel Ansaah Addae et al. Heliyon. .

Abstract

The aim of this research is to examine the trend of water use efficiency (WUE) and the spillover effect of its determinants in 28 sub-Saharan Africa (SSA) countries over the period 2007 to 2018 using the directional distance function (DDF) and the spatial Durbin model. Results of the DDF revealed that the most efficient countries include Botswana, and Liberia whereas countries with poor performance include Niger and South Africa. Also, the average efficiency scores over the study period improved steadily from 0.582 in 2007 to 0.698 in 2018. The study showed that under economic distance weight in the spatial Durbin model, the values of the spatial lag coefficients of urbanisation (URB), export (EX), and education (EDU) depict positive and statistically significant effects on WUE, while industrial activities (IND), foreign direct investment (FDI), and government interference (COR) had an adverse influence on WUE in SSA. Results of the spatial decomposition effect of URB demonstrated a major impact on WUE in both the local and adjacent countries. However, a significant decline of WUE through the direct and indirect impacts of FDI, EX, and COR in the local and neighboring countries was recorded which indicate the presence of a negative spatial dependency on WUE in SSA. The outcome of this study implies that policymakers in SSA countries must strengthen sustainable water resources management decisions with neighbouring countries to achieve sustainable development goal 6 by 2030 and beyond.

Keywords: Directional distance function; Moran's index; Spatial effects; Spatial panel approaches; Water use efficiency; sub-Saharan Africa.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Water use efficiency in sub-Saharan Africa.
Figure 2
Figure 2
Overall mean score of water use efficiency between 2007 and 2018.
See this image and copyright information in PMC

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