Volatility Expansion
Volatility expansion refers to a rapid increase in the standard deviation of an asset price, often preceding or accompanying major trend shifts. In the context of derivatives, this is measured by the change in implied volatility as market participants scramble to hedge their positions.
When price action becomes parabolic, the realized volatility often spikes as the market struggles to find equilibrium. This expansion forces risk management engines to adjust margin requirements, which can further impact liquidity and price stability.
It is a critical metric for options traders, as it directly affects the pricing of premiums via the Vega component of the Greeks. Understanding volatility expansion is essential for assessing the risk of systemic contagion during market stress.