Ben Graham believed in separating investing from speculation. But he also separated speculation from intelligent speculation because some amount of speculation always exists in prices. The reason: the future is uncertain.
Because the future is uncertain, the market is the collective best guess on what will happen next. But Graham knew that Mr. Market sometimes guesses wrong. Therein lies the opportunity for investors willing to focus on facts in a way that puts the odds in their favor.
I’ve highlighted pieces of a Ben Graham lecture the past couple weeks. In his last lesson, Graham offers a framework for thinking about investing, intelligent speculation, diversification, and probabilities that are worth reading. Continue Reading…

I finished reading a series of Graham lectures from a course he taught in 1946. The full transcripts are published online and linked below. The course focuses on potential problems in security analysis following World War II (Graham’s worry is the extrapolation of WWII market performance into the future).