Explanation
The value delivered by a product can not be determined by revenue alone, because:
* Revenue is only one aspect of value, and it may not reflect the true impact or benefit of the product for the stakeholders, the users, and the society. For example, a product may generate high revenue, but also cause environmental damage, ethical issues, or customer dissatisfaction.
* Value is a subjective and relative concept, and it may vary depending on the context, the perspective, and the criteria of the evaluation. For example, a product may have different value for different segments of customers, or for different markets or regions.
* Value is dynamic and emergent, and it may change over time due to various factors, such as feedback, competition, innovation, or regulation. For example, a product may lose its value as new alternatives or solutions become available, or as customer needs or preferences evolve.
References:
* Scrum Guide 2020, page 6: "The Product Owner is accountable for maximizing the value of the product resulting from the work of the Scrum Team."
* Scrum Guide 2020, page 11: "The Product Goal describes a future state of the product which can serve as a target for the Scrum Team to plan against."
* Scrum Guide 2020, page 11: "The Product Owner is accountable for effective Product Backlog management, which includes ... optimizing the value of the work the Scrum Team performs."

Explanation
* The Sprint Review is an event that occurs at the end of each Sprint, where the Scrum Team and the stakeholders inspect the Increment and adapt the Product Backlog if needed. The Sprint Review is an opportunity for the Product Owner to validate that the Increment meets their expectations and delivers value to the customers and users. The Sprint Review is also an opportunity for the Developers to demonstrate their work and receive feedback from the Product Owner and the stakeholders.
* Stakeholders are people external to the Scrum Team who have a stake or interest in the product, such as customers, users, sponsors, managers, or other teams. Stakeholders provide valuable input, feedback, and insights to the Scrum Team regarding the product vision, goals, value proposition, requirements, features, functions, quality, usability, or market conditions.
* Collecting stakeholder feedback is one of the main purposes of the Sprint Review. Stakeholder feedback can help the Scrum Team to:
* Assess the value and quality of the product Increment and identify any gaps or issues that need to be addressed.
* Understand the needs and expectations of the customers and users and discover new opportunities or ideas for improvement or innovation.
* Align and collaborate with the stakeholders on the product direction and priorities and ensure transparency and trust.
* Adapt the Product Backlog based on the feedback and data and plan for the next Sprint.
References:
* Scrum Guide: https://www.scrumguides.org/scrum-guide.html
* Sprint Review: https://www.scrum.org/resources/what-is-a-sprint-review
* Stakeholders: https://www.agilealliance.org/glossary/stakeholders

Explanation
* The Product Backlog is an ordered list of everything that is known to be needed in the product. It is the single source of truth for the Scrum Team and the stakeholders. It contains all the requirements, features, functions, enhancements, fixes, and anything else that can deliver value to the customers and users of the product.
* The Product Owner is accountable for ordering the Product Backlog. The Product Owner orders the items in the Product Backlog based on factors such as value, risk, priority, dependency, feedback, or market conditions. The order of the Product Backlog items provides a clear and consistent indication of what is most important and urgent for the product. The order of the Product Backlog items also helps the Scrum Team and the stakeholders to plan and forecast effectively.
* The tools and techniques used to create, manage, or refine the Product Backlog are not a valid consideration when ordering the Product Backlog. The tools and techniques are means to an end, not an end in themselves. The tools and techniques do not affect the value or quality of the product or service delivered. The tools and techniques may vary from one Product Owner to another, depending on their preferences, skills, or context. The tools and techniques may also change over time, as new technologies or practices emerge or evolve.
References:
* Scrum Guide: https://www.scrumguides.org/scrum-guide.html
* Product Backlog: https://www.scrum.org/resources/what-is-a-product-backlog
* Product Owner: https://www.scrum.org/resources/what-is-a-product-owner