1. The document discusses challenges and solutions for peer-to-peer sharing economies. It addresses how to make sharing economies as desirable as consumerism by leveraging mainstream values like minimalism. 2. Building and measuring trust between users is another challenge. The document proposes focusing on trustworthiness by taking ownership of user profiles and leveraging existing trust from other platforms. 3. Finding a sustainable revenue model is difficult due to the small individual transaction sizes. The document suggests exploring a tiered membership or listing fee model rather than commissions to generate revenue at scale.