"During 1983 our book value increased from $737.43 per share to $975.83 per share, or by 32%. We never take the one-year figure very seriously. After… - Warren Buffett

"During 1983 our book value increased from $737.43 per share to $975.83 per share, or by 32%. We never take the one-year figure very seriously. After all, why should the time required for a planet to circle the sun synchronize precisely with the time required for business actions to pay off? Instead, we recommend not less than a five-year test as a rough yardstick of economic performance. Red lights should start flashing if the five-year average annual gain falls much below the return on equity earned over the period by American industry in aggregate. (Watch out for our explanation if that occurs as Goethe observed, “When ideas fail, words come in very handy.")