The document discusses the rise of online marketplaces projected to reach $7 trillion in sales by 2024, emphasizing the advantages of using turnkey multi-vendor website builders such as ease of implementation and cost-effectiveness. It outlines essential features required for successful marketplace builders catering to administrators, vendors, and customers, including product management tools and seamless payment integrations. Additionally, it suggests using StoreHippo for building niche or horizontal marketplaces and invites readers to start a free trial or book a demo.