VIX is nothing more than the market's implied 'factor' that makes the supply-demand of options prices fit with model-based parameters. In simple terms it measures the market's expectations for volatility (up or down moves - not just down) going forward. Empirically it has a relationship with realized volatility - how much the market actually moved up or down relative to what VIX expected - and professionals will use various 'scalping' techniques to lock in day-to-day gains from the difference between the market's actual movement and what options prices expected. To wit: the current expectations of central bank ... (full story)