Hans Peter Hahn, Universität Bayreuth
Vertical and horizontal integration of  traders
•Networks integrate in a horizontal manner: All traders at the same level need to cooperate in order to meet the harsh conditions of the economic life in Africa;
•Networks also integrate vertically: Traders suppliers and clients cooperate, in order to minimize the risks of their economic engagement;
Networks are structures of common and unspecified interests: areas of common interest are marked in the diagram with dotted spaces