This document discusses the importance of intelligence in scaling e-commerce businesses. It outlines three key problems: how to merchandise and sell products most effectively, identify the best sellers for customers, and detect low quality products among millions of listings. The document advocates using customer insights and analytics at every step of the customer journey to personalize the experience and gain intelligence about browsing behavior, purchase histories, product relationships, seller performance, and more. This level of intelligence and personalization can help solve the challenges of scaling by informing pricing, promotions, bundling, ads, seller prioritization, and identifying problematic products through signals from customer returns, feedback and conversion funnel data.