The Millionaire Next Door by Thomas Stanley

Thomas Stanley's The Millionaire Next Door shattered the flashy-wealth stereotype by revealing that 80% of millionaires are first-generation wealthy, living in ordinary neighborhoods and driving used cars. Compared to I Will Teach You to Be Rich by Ramit Sethi's 6-week program, Stanley's focus on long-term frugality offers a slower but more reliable path to seven-figure net worth.