In this study, our objective is to analyse the effects of a competitive supply chain with single commodity, multiple retailers and a common supplier when there is a rivalry among the retailers. The market demand of the product is assumed to be price dependent and to be enhanced by providing effective promotional effort. We also assume that the supplier's wholesale price is the same for all retailers. The retailers determine their market sales price(s) and promotional efforts to optimise the profit from the perspectives of the individual and the whole supply chain. We also analyse the coordination mechanisms among the members of the chain with several contracts and find the optimal range for the contract parameters. Finally, we investigate the model by the collective numerical data and also provide the graphical illustration of the comparison among the coordination mechanisms by the contracts.
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