Warren Buffett: Why stocks beat gold and bonds - The Term Sheet: Fortune's deals blog Term Sheet

Warren Buffett: Why stocks beat gold and bonds - The Term Sheet: Fortune's deals blog Term Sheet: From our definition there flows an important corollary: The riskiness of an investment is not measured by beta (a Wall Street term encompassing volatility and often used in measuring risk) but rather by the probability -- the reasoned probability -- of that investment causing its owner a loss of purchasing power over his contemplated holding period. Assets can fluctuate greatly in price and not be risky as long as they are reasonably certain to deliver increased purchasing power over their holding period. And as we will see, a nonfluctuating asset can be laden with risk.