Warren Buffett employs investment principles that he describes as “simple, old, and few.” Many of Buffett’s methods evolve from his personality and character. Others he has learned from teachers and experience. Like all good students, he uses his training as a foundation. In time, he stacked the bricks far higher than his best teachers.
Buffett returns again and again to Ben Graham:
“I consider there to be three basic ideas, ideas that if they are really ground into your intellectual framework, I don’t see how you could help but do reasonably well in stocks. None of them are complicated. None of them take mathematical talent or anything of the sort. [Graham] said you should look at stocks as small pieces of the business. Look at [market] fluctuations as your friend rather than your enemy—profit from folly rather than participate in it. And in [the last chapter of The Intelligent Investor], he said the three most important words of investing: ‘margin of safety.’ I think those ideas, 100 years from now, will still be regarded as the three cornerstones of sound investing.”
Buffett summarizes Graham this way:
“When proper temperament joins with proper intellectual framework, then you get rational behavior.” ...