Michael Mauboussin is a highly respected investor, teacher, speaker and book writer. I came across a number of his notes in the past (including this one which I liked a lot). Thanks to the Internet and the many people who share good thinking, most of his notes are there to grasp and read.
While re-populating my blog, I came into his 1997 reflections on valuation. As Graham/Buffett nicely put it: price is what you paid, value is what you get. So to earn decent return when investing, you need to know the value so you can pay a price that gives you a good margin of safety.
The full note is available to read here. I just wrote down a couple of remarks that make sense to me and hopefully give you a quick overview of why it might be useful and what you will find inside.
Key purpose of the note is to defend the value-based approach of investing, to keep in mind what really matters in valuation and not to fall into « market myths ».