Most investors systematically destroy returns through emotional decisions and poor behavior, not lack of intelligence. Barry Ritholtz, legendary fund manager, reveals why 90% of active traders underperform a simple index strategy, how panic selling during crashes costs millions in lifetime wealth, and the specific behaviors that separate winning from losing portfolios—including why even billionaire executives make the same mistakes as retail traders. Panic selling during market crashes causes one in three investors to never return to equities, costing them 10x returns over decades as markets recover and compound.