When using scrum, who is primarily responsible for making scope versus schedule trade-off decisions?

The product owner is primarily responsible. The Scrum system is a framework used to manage knowledge work, specially software development. The product owner is the one who represents the product's stakeholders (he is the key stakeholder), as well as the customer. It is his responsibility to maximize the value delivered by the team.

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- "chilles is sad and angry because hector, the trojan leader, killed his best friend patroclus. he seems angry with himself because he didn't or protect patroclus against the trojans."