Historically, the Chicago Board Options Exchange Volatility Index —
or VIX, for short — has been a bellwether benchmark for measuring the
volatility of the U.S. financial markets.
Its formula is fairly simple: Take a mathematical estimate of how
investors believe the S&P 100 Index option (OEX) will move in the
next year using a calculation based on the disparity between current OEX
put and call option prices.
In that equation, the VIX rises when put option purchases move upward and declines when call option activity is robust.
In general, a “read” on the VIX is the result of that formula over a
30-day trading period. A high VIX figure means traders fear a volatile
market environment. (more)
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