Many people are familiar with the name Warren Buffett. Buffett is a world-renowned investment wizard and a representative figure of the philosophy of value investing. Known as the “Oracle of Omaha”, Buffett has been able to consistently maintain a high return of 20% for many years. How does he achieve this? This book systematically illustrates Buffett’s economic moat theory. The sole purpose is to teach investors to pick stocks accordingly and to construct high-return portfolios.