The document discusses identifying economic moats in companies as a strategy for long-term investing. It defines an economic moat as a competitive advantage that allows a company to generate above-average returns. The four main types of moats are intangible assets, network effects, cost advantages, and efficient scale. The document provides examples of companies that have strong moats and cautions that moats can erode over time. It recommends evaluating long-term return on capital and pricing metrics like P/E and P/S ratios to identify attractively priced companies with durable moats.