This conceptual distinction is one of the most valuable reframes in investor education, and Fisher makes it with unusual clarity. Academic finance defines risk as variance — the statistical dispersion of returns around a mean. That definition is useful for portfolio construction math but toxic for individual investor psychology, because it treats a 30% drawdown that fully recovers as equivalent in "risk" to a 30% drawdown that leads to permanent loss.

For long-term investors, these two scenarios are not equivalent at all. A stock that falls 40% and recovers over 18 months has produced a terrible experience but zero permanent impairment if the investor held through it. An investor who sold at the bottom and never re-entered converted a temporary loss into a permanent one — which is precisely the behavior that confusing volatility with risk produces.

Fisher's argument is that investors who internalize the volatility-as-risk framing are systematically driven toward behavior that increases their actual risk (permanent loss through panic selling) in order to reduce their perceived risk (the discomfort of watching prices fall). The financial-planning industry reinforces this confusion by showing clients risk-tolerance questionnaires that measure emotional reaction to paper losses rather than the true risk of not meeting long-term financial goals.

The corrective is to anchor risk assessment on time horizon and real financial need. For a 35-year-old saving for retirement, a 30% drawdown in an equity portfolio is not a risk event — it is a buying opportunity. The real risk is holding too little equity for too long and failing to accumulate enough capital.