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This article studies a coalition-formation problem for cooperative replenishment with a single supplier and multiple firms. We consider that a vertical cooperation between the supplier and the set of firms is already set, using periodic individual contracts, and we investigate the profitability of a horizontal cooperation between firms when designing collaborative contracts. Given the significant savings that can be realized thanks to horizontal collaboration, the main interest of the potential collaborating firms is to figure out how the collaborating group should be formed and how stable alliances and coalitions should be generated. In this article, the two questions are studied in two business situations focusing either on the collaboration opportunities in the ordering or the transportation process. In each collaborative situation, a decision-making approach is applied to assess the expected profitability of each firm and to …