Intrinsic value can be defined simply: It is the discounted value of the cash that can be taken out of a business during its remaining life. The calculation of intrinsic value, though, is not so simple. As our definition suggests, intrinsic value is an estimate rather than a precise figure, and it is additionally an estimate that must be changed if interest rates move or forecasts of future cash flows are revised.
Warren BuffettI bought my first stock in 1942, in the summer of '42. I was 11 years old. And so 75 years have gone by. And I have never known what the market's going to do the next day. And that's not my game. My game is to decide whether I'm in the right economy, which America's definitely been ever since that time. The Dow has gone from 100 to 21,000 during that time. And no matter what the headlines say, or terrible things are happening - we were losing the war in the Pacific when I first bought stocks.
Warren Buffett