Source
When this applies
when assessing whether an operating model represents a truly rare, hard-to-replicate competitive advantage versus an ordinary business
The takeaway
Rare great businesses often look obvious in hindsight but combine several mutually reinforcing elements that are individually easy to copy but collectively very hard to replicate with equal discipline.
Why it works
Costco combined genuinely lower prices, operational discipline (parking, store layout), capital-light inventory financed by supplier float, and loyalty rewards, which together created a self-reinforcing moat that looked simple but was rarely executed well.
One level up
The best investment opportunities are recognizable not by complexity but by the rarity of consistent, disciplined execution of simple truths.
Where it stops holding
This stops working when the perceived simplicity leads competitors to think it's 'easy,' causing them to under-invest in the execution discipline required, or when an investor over-pattern-matches ordinary retailers to this rare case.
Detail
situation: Munger visited Saul Price's Price Club and later invested in it before its merger with Costco; he describes it as selling genuinely cheaper than anyone, with efficient, well-designed stores and reward-based membership.
decision: He bought Price Club stock in the market and later joined Costco's board at Jim Senegal's invitation instead of Warren Buffett.
outcome: Costco became one of the handful of career-defining investments Munger describes as rare 'you know you're right' opportunities.
lesson: True rare opportunities combine simple, visible advantages (price, model) with capital-light structure (supplier-financed inventory) — the hard part is recognizing them as rare rather than assuming they're easy to replicate.
In their words
But there aren't many times in a lifetime when you know you're right and you know you have one that's really going to work wonderfully. Maybe five, six times in a lifetime, you get a chance to do it.