Please help me in this assignment. Why should a firm such as Dell take into account total supply chain profitability when making decisions?

Dell realizes that their ultimate success lies with the success of their supply chainand its ability to generate supply chain surplus. If Dell was to view supply chainoperations as a zero sum game, they would lose their competitive edge as their suppliers’ businesses struggled. Dell’s profit gained at the expense of their supplychain partners would be short lived. Just as a physical chain is only as strong as itsweakest link, the supply chain can be successful only if all members cooperateand focus on a global optimum rather than many local optima.HOPE IT HELPS (◕‿◕✿)

you forgot the rest of the question sorry