Assets Quote by Charlie Munger
“Black-Scholes works for short-term options, but if it's a long-term option and you think you know something [about the underlying asset], it's insane to use Black-Scholes.”
About This Quote
Source Speech: Annual Meeting, Berkshire Hathaway, 2005
Black‑Scholes is unsuitable for long‑term options when you claim insight into the underlying asset; it becomes irrational.
In simple terms: Black‑Scholes fails for long‑term speculative bets.
Use appropriate valuation models.
Themes
Mood
Type
When to use this quote
- portfolio management
- investment strategy
- risk assessment
Key Concepts
Questions to Reflect On
- When is Black‑Scholes still useful?
- How to assess model suitability?
It may overlook cases where the model is adjusted for long horizons.