The historical record shows that assets which have delivered meaningful real returns over long periods—equities, real estate, credit—have generally done so alongside significant short-term price fluctuations. Whether that relationship reflects compensation for bearing uncertainty, or simply the mechanics of how productive assets are priced, remains debated. What is clear is that investors who exited during periods of elevated volatility have consistently earned lower long-run returns than those who stayed invested. The assets that minimise short-term fluctuations—cash, short-dated government bills—typically offer more stable but lower expected real returns and, in inflationary environments, may carry genuine purchasing power risk. This piece examines the mechanics of market volatility: how it is defined and measured, what drives it in practice, and what the empirical evidence suggests smart investors should do when it spikes. We draw on market history, factor research, and portfolio construction principles throughout.
