Conventional financial theory considers ex-ante that risk, generally measured by the volatility, has to be …

influence of different investor types' net options demand on the KOSPI200 options-implied volatility dynamics. We extend Bollen … impacts of net buying pressure on implied volatility, and the effect of regulatory reform in the options market. Our empirical … institutions' net demand is the most informative about the underlying market volatility independent of the market reform, while …