A Century of U.S. Stock Returns: Why the Average Hides More Than It Reveals
Imagine buying U.S. stocks at some random moment over the past hundred years and then asking a simple question: what actually happened next? Not on average, not in theory — what happened to your money over the following month, year, decade, or two? The honest answer is unsettling for anyone who likes tidy numbers: it depends enormously on which “next” you’re asking about, and the single average return figure that gets quoted in almost every retirement calculator obscures that fact almost completely.