While the world trading system is being reshaped by regional integrations, many of them are witnessing the expansion and the deepening of the degree of integration. This paper focuses on COMESA and uses trade flows to study the trade effects of its later expansion. The effects are assessed both toward newcomers and toward some old member countries. Outcomes obtained through descriptive evidence and a series of regression, using export and import volume at aggregate level show that; first, COMESA’s expansion has resulted into trade creation toward newcomers, while this expansion has not led to a trade diversion among old member countries. Second, COMESA’s creation has resulted into relati
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