Sub-Saharan Africa industry tenders

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In macroeconomics, an industry is a branch of an economy that produces a closely-related set of raw materials, goods, or services. When evaluating a single group or company, its dominant source of revenue is typically used by industry classifications to classify it within a specific industry. However, a single business need not belong just to one industry, such as when a large business diversifies across separate industries. Industries, though associated with specific products, processes, and consumer markets, can evolve over time. One distinct industry (for example, barrel making) may become limited to a tiny niche market and get mostly re-classified into another industry using new techniques. At the same time, entirely new industries may branch off from older ones once a significant market becomes apparent (as the semiconductor industry becomes distinguished from the wider electronics industry). Industry classification is valuable for economic analysis because it leads to largely distinct categories with simple relationships. However, more complex cases, such as otherwise different processes yielding similar products, require an element of standardization and prevent any one schema from fitting all possible uses. "

Sub-Saharan Africa is, geographically, the area of the continent of Africa that lies south of the Sahara. According to the United Nations, it consists of all African countries and territories that are fully or partially south of the Sahara. While the United Nations geoscheme for Africa excludes Sudan from its definition of sub-Saharan Africa, the African Union's definition includes Sudan but instead excludes Mauritania. Since probably 3500 BCE, the Saharan and sub-Saharan regions of Africa have been separated by the extremely harsh climate of the sparsely populated Sahara, forming an effective barrier interrupted by only the Nile in Sudan, though navigation on the Nile was blocked by the Sudd and the river's cataracts. The Sahara pump theory explains how flora and fauna (including Homo sapiens) left Africa to penetrate the Middle East and beyond. African pluvial periods are associated with a Wet Sahara phase, during which larger lakes and more rivers existed. Countries in Sub-Saharan Africa are Angola, Benin, Botswana, Burkina Faso, Burundi, Cabo Verde, Cameroon, Central African Republic, Chad, Comoros, Congo, Democratic Republic of, Congo, Republic of, Cote d'Ivoire, Equatorial Guinea, Eritrea, Ethiopia, Gabon, Gambia, The, Ghana, Guinea, Guinea-Bissau, Kenya, Lesotho, Liberia, Madagascar, Malawi, Mali, Mauritania, Mauritius, Mozambique, Namibia, Niger, Nigeria, Rwanda, Sao Tome and Principe, Senegal, Seychelles, Sierra Leone, Somalia, South Africa, South Sudan, Sudan, Tanzania, Togo, Uganda, Zambia, Zimbabwe.