The Knowledge Illusion by Steven Sloman and Philip Fernbach was a very interesting read - found it on an investment manager's list of must-reads (can't remember whose list). Essentially the idea is that so much of what we think we "know" is not knowledge that we actually possess. It's stored elsewhere instead:
Other People (I know that this vaccine is effective...but only because my doctor recommends it)
The Environment (I know how to get around New York City...but only because of the street sign)
Artifacts and Tools (I know how to cut a piece of wood...but only because my saw was designed the way that it was)
Our Bodies (I know how to hit a golf ball...but only because my body does it automatically - don't ask me to explain how I hit straight)
And, sometimes, we actually know and understand what we say we know and understand.
I found the concept interesting, but - more importantly - I wanted to explore how it relates to what we do on this forum and the stock market at large. First, there's the efficient market hypothesis, which - even if you don't believe it's entirely true - is a fairly good representation of the idea that knowledge is held elsewhere. Knowledge about company value is contained both in the price, and in all of the other analysis that we consume. Stock prices contain the collective knowledge about a company's value, in addition to other clues about market sentiment, societal trends, etc.
There's relevance, too, with the tools and artifacts we rely on for analysis. Particular books (think The Intelligent Investor) allow us to feel like we possess certain knowledge, while long-used tools (think screeners, ratios) give us that impression as well.
Finally, there is community knowledge stored on this forum: the company's that are pitched and analyzed; the commenters and comments; the topics that are circulated and debated. I've found myself wondering when and if I can allow myself to know that a certain company will succeed in the long-run just because particular users, or a certain number of them on this forum, seem to to know it. Conversely, I worry that I've waded into certain stocks because of the knowledge illusion.
Maybe not much of that knowledge is truly mine, or maybe it doesn't exist to begin with. Maybe I don't know much, after all.