What it means
The VIX is calculated from the prices of SPX options across strikes, weighted to produce an estimate of expected 30-day volatility. Quoted in annualized percentage points.
Why it matters
VIX is the most-watched market sentiment indicator on Earth. Moves above 30 typically coincide with stress; sustained levels below 13 typically precede tops. It's the input to most volatility-based trading strategies.
How to use it
Don't trade the VIX directly - it's not investable. Trade VXX, UVXY, SVXY (with caution), or SPX options. Watch the VIX term structure (front-month vs longer): contango is normal; backwardation is a stress signal.
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