Volatility Indexes seem to point to the Past
In theory, by trading options, market participants asses and set future volatilities that can be identified using the Black-Scholes-formula in reverse. In reality, as regression analysis suggests, it is historical market data which instead are used to determine future values. Further analysis shows that historical volatilities are insufficient predictors. Yet this questionable practice is considered by international accounting standards (IAS/IFRS) to allow "historical data and implied volatilities" for "reasonable estimations". In a kind of short-circuit, historical volatilities are introduced into option trading and returned as implied volatilities. In reality, both differ significantly from future values. Comparing the volatility of the past nine weeks with that of the following nine weeks, estimation error ranges from four to over ten percentage points. (No paper found in the net challenging the implied hypothesis of IAS 39/AG82(f))
|Date of creation:||20 Oct 2009|
|Date of revision:|
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