Chris Reining retired at age 37 as a self-made millionaire. He had planned his portfolio to support him with $48,000 a year, but after two years found he only needed about $30,000 a year to live. He's found that he's just as happy spending less than he planned, and less than he lived on when he was working. This disconnect between his expected and actual spending made him realize that happiness comes from being satisfied with what you already have. How much money buys happiness?