The Millionaire Next Door by Thomas J. Stanley and William D. Danko reveals that most millionaires are not flashy or extravagant, they’re ordinary people who quietly build wealth through discipline, frugality, and smart financial habits. The book breaks the stereotype of luxury-driven millionaires by showing that true wealth often hides behind modest lifestyles, high savings rates, and long-term investing. It’s essentially a manual on how financial independence comes from behavior, not income.