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Saving money is rooted in centuries of financial wisdom. Benjamin Franklin's 1758 essay The Way to Wealth popularized A penny saved is a penny earned. The first modern savings bank opened in Hamburg in 1778, and compound interest, called by Einstein the eighth wonder of the world, can transform small amounts: $5,000 invested at 7 percent annual return (the historical S&P 500 average) becomes $38,000 in 30 years. Personal finance experts like Dave Ramsey and Suze Orman recommend the 50/30/20 rule: 50 percent needs, 30 percent wants, 20 percent savings. An emergency fund of 3 to 6 months expenses protects against job loss. The FIRE movement (Financial Independence, Retire Early) advocates saving 50 to 70 percent of income to retire by 40. Index funds, popularized by Jack Bogle (Vanguard, 1975), let anyone invest cheaply.