January 7th, 2006, 10:44 am
QuoteOriginally posted by: mghigginsThey mean implied vol, not realised vol. Implied vol is just another way of expressing the market option price, though, so it doesn't say much to answer your question by saying "vol changes"; it's equivalent to saying that the option price changes.ft..so what's the factor?players' expectation on vol? supply demand? underlying movement?