The document outlines four challenges of achieving sustainable consumption and closed loop business models: 1) Engaging consumers in sustainable consumption through value creation and market relevance. 2) Developing lifecycle metrics to identify strategic investment opportunities through lifecycle thinking. 3) Facilitating innovation exchange to build trust on sustainability strategies through intellectual property and technology sharing. 4) Establishing policies to accelerate appropriate business models and transition businesses to closed loop strategies. It also lists five principles - innovation, collaboration, investment, values, and leadership - to address these challenges.

1. Four Challenges of Sustainable Consumption World Economic Forum

3. Four Challenges Involving three stakeholders

9. Companies taking the lead on sustainability will be market makers rather than market takers.