FrameworkRiskLetter located
Risk is the probability of losing purchasing power, not the volatility of the price
Measure risk as the chance of ending the holding period with less buying power, which makes volatile productive assets safer than stable unproductive ones.
Any debate about what risk means, portfolio construction over long horizons, and questions about gold or cash as safe assets.
From Berkshire Hathaway's 2011 letter to shareholders · Warren Buffett