“…Therefore, in such a case, not only the retailers’ profit is affected, but also the manufacturer’s performance is exacerbated. In the literature, various promotional offers, such as purchase price ( Bulmuş et al, 2014 ), reward-penalty ( Wang et al, 2017 ), discount offer ( Taleizadeh et al, 2019 ), economic incentives ( Hosseini-Motlagh et al, 2020c ), collection investment ( Sabbaghnia and Taleizadeh, 2020 ), and acquisition price ( Hosseini-Motlagh et al, 2020a ), have been proposed to augment the collection amount of used products, while CSR participation has not been studied in this regard. We contribute to this literature and investigate the case where two competitive retailers exert CSR as an incentive policy to raise the consumers’ willingness to return their plastic containers, which also affects the demand for new products.…”