We shall treat all forecasts in pitch books by startups as guesswork, not analysis.
Latest memo from Howard Marks: Knowledge of the Future
As I showed by using it again in last week’s memo, I was impressed by the observation of Marc Lipsitch, Harvard epidemiologist, that there are (a) facts, (b) informed extrapolations from analogies to other viruses and © opinion or speculation. He said it in connection with the novel coronavirus, but I’ve been thinking about its relevance to investing.
In the past, I’ve defined investing as the act of positioning capital so as to profit from future developments. I’ve also mentioned the challenge presented by the fact that there’s no such thing as knowing what future developments will be. This is the paradox we must deal with.
To follow Lipsitch’s analysis, in our world of investing:
- there are few if any facts regarding the future,
- the vast majority of our theorizing about the future consists of extrapolating from past patterns, and
- a lot of that extrapolation – and just about all the rest of our conclusions – consists of what Lipsitch calls opinion or speculation and what I call guesswork. (George Bernard Shaw said, “All professions are conspiracies against the laity.” Thus the rules of the investment profession seem to require that its members describe their views about the future using high-sounding terms like “analysis,” “assessment,” “projection,” “prediction” and “forecast.” Rarely do we see the word “guess.”)