The CBOE Volatility Index is designed to be a measure of volatility in the overall market. Without getting too technical, it is based on the volatility of S&P 500 options. The options are rotated in and out, as one month's options expire and then a new month is added on.
Under normal circumstances, the VIX goes up when the market declines and goes down when the market rises.
Over the past week though, the VIX has been behaving rather oddly. On Friday June 6, the VIX jumped over 26 percent as the market took its nosedive. Then, this past Wednesday when the Dow dropped another 200 points, the VIX was only up four percent.
On Thursday, the Dow was up 57 points and the VIX was down 3.3 percent.
As you can see this is not a perfect inverse relationship between the VIX and the overall market. I know I am comparing it to the Dow rather than the S&P, but the differences in the percentage movements are not that great.
Personally, I think the problem stems from the options on the VIX. A few years ago, the CBOE started offering options on the VIX. To my knowledge, only the hardcore traders are trading the VIX options.
I can say that since the introduction of VIX options, the VIX itself has become a less reliable indicator for me. I always thought of the VIX as a good gauge of overall fear in the market. When puts were being bid up more than the calls, the fear level was increasing and the VIX was rising.
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