You don’t have to understand every opportunity. You have to recognize which ones you can understand.
We often assume that good judgment requires developing an opinion on every important question or opportunity.
But some problems are extraordinarily difficult to evaluate, and attempting to solve them may consume enormous resources without producing reliable conclusions.
One of the most valuable thinking skills is knowing when a problem is too difficult to justify pursuing.
The Three Baskets
Warren Buffett and Charlie Munger developed a simple method for evaluating investment opportunities: sort them into three categories.
- Yes: Opportunities we understand and consider attractive.
- No: Opportunities we understand sufficiently to reject.
- Too Hard: Opportunities we cannot evaluate with sufficient confidence.
At Berkshire Hathaway’s 2006 annual meeting, Buffett explained:
“A lot of things end up in the ‘too hard’ pile, and it doesn’t bother us.”
The distinction between No and Too Hard is particularly important.
Rejecting something because it is unattractive is different from declining it because we cannot determine whether it is attractive.
Not understanding an opportunity is not evidence that it is bad. It is evidence that we are not qualified to judge it.
The Circle of Competence
The Too Hard Basket is closely related to Buffett’s concept of the Circle of Competence.
In his 1996 Berkshire Hathaway shareholder letter, Buffett wrote:
“The size of that circle is not very important; knowing its boundaries, however, is vital.”
Mohnish Pabrai adopted this discipline in his own investment approach. Asked whether he followed Munger’s three-category framework, Pabrai responded:
“That’s right, and 98% is too difficult!”
The message is not that difficult problems cannot be solved. It is that we have limited time, knowledge, and resources.
We do not need to solve every problem to achieve exceptional results. We need to identify the problems we are well positioned to solve.
The Practical Principle
Before committing significant resources to an opportunity, ask:
- Do I understand it? Can I explain the important mechanisms, risks, and uncertainties?
- Can I evaluate it reliably? Do I possess the knowledge necessary to distinguish a good opportunity from a bad one?
- What would it take to understand it? Consider the cost of acquiring additional knowledge.
- Is the effort justified? Could the same resources produce better results elsewhere?
- Can I simply pass? Determine whether making a decision is actually necessary.
There is an important qualification. Some problems cannot be avoided. Buffett and Munger acknowledged that serious personal and societal problems sometimes require us to act despite considerable uncertainty.
Nor should the Too Hard Basket become an excuse for intellectual laziness. We can expand our circle of competence through learning and experience.
But when participation is optional, declining to engage with something we cannot adequately evaluate may be the most rational choice.
The fundamental insight is that we gain an advantage not by understanding everything, but by recognizing the limits of our understanding and concentrating our efforts where we can exercise sound judgment.
Sometimes the smartest decision is to put something in the Too Hard Basket and move on.
References
- Buffett, W., & Munger, C. (2006). Berkshire Hathaway Annual Meeting, morning session. Discussion of the three categories: In, Out, and Too Hard.
- Buffett, W. (1996). Berkshire Hathaway Shareholder Letter. Discussion of the Circle of Competence.
- Buffett, W., & Munger, C. (2007). Berkshire Hathaway Annual Meeting, afternoon session. Discussion of optional versus unavoidable problems.
- Pabrai, M. (2025). Interview with The Investor’s Podcast. Discussion of Buffett’s Too Hard Pile and the Circle of Competence.