Risk

Summary

Buffett rejects the academic definition of risk, which equates risk with past price volatility (Beta). Instead, he defines risk as the possibility of loss or injury, specifically the risk that the investment’s after-tax receipts will not maintain their purchasing power plus a modest rate of interest over the holding period.

Origin & Context

In the 1993 Letter, Buffett provides his definitive critique of modern finance theory's equating of volatility with risk. He argues that measuring "Beta" completely ignores the actual economics of a business.

2007: "Wired Differently"

At the 2007 Meeting, Buffett and Munger refined their critique:

• Beta Critique: Buffett reiterated that Beta is popular because it's easy to calculate, but it has nothing to do with risk. He compared it to measuring a man's shoe size to determine his intelligence.
• True Definition of Risk: "Risk comes from not knowing what you're doing." — Warren Buffett, 2007 Meeting.
• The Catastrophe Lens: In looking for a successor, Buffett noted that the right candidates look at risk as "catastrophe avoidance" rather than a volatility band. They are "wired differently" to never risk what they have and need for what they don't have and don't need.

💬 Direct Quotes

• "It is better to be approximately right than precisely wrong." — 1993 Letter
• "Risk comes from not knowing what you're doing." — 2007 Meeting
• "Managed futures: Their performance is likely between lousy and negative." — 2007 Meeting (Example of poor risk/reward trade-off).

🔗 Connections

• Related Concepts: Volatility vs Risk, Margin of Safety, Catastrophe Risk
• Related Entities: Ajit Jain, GEICO
• Key Sources: 1993 Letter, 2007 Annual Meeting