Backward and forward linkages should also be reinforced, in particular by creating natural resource-based production clusters. These are sectoral and/or geographical concentrations of enterprises engaged in interlinked activities based on the exploitation and processing of natural resources and their supporting industries (UNECA, 2013). The data in annex table 4, show that the resource gap of fuel-exporting LDCs is positive, which means that their savings rate is higher than their investment rate.