Does Net Buying Pressure Affect the Shape of Implied Volatility Functions?
Article first published online: 25 MAR 2004
The Journal of Finance
Volume 59, Issue 2, pages 711–753, April 2004
How to Cite
Bollen, N. P. B. and Whaley, R. E. (2004), Does Net Buying Pressure Affect the Shape of Implied Volatility Functions?. The Journal of Finance, 59: 711–753. doi: 10.1111/j.1540-6261.2004.00647.x
- Issue published online: 25 MAR 2004
- Article first published online: 25 MAR 2004
This paper examines the relation between net buying pressure and the shape of the implied volatility function (IVF) for index and individual stock options. We find that changes in implied volatility are directly related to net buying pressure from public order flow. We also find that changes in implied volatility of S&P 500 options are most strongly affected by buying pressure for index puts, while changes in implied volatility of stock options are dominated by call option demand. Simulated delta-neutral option-writing trading strategies generate abnormal returns that match the deviations of the IVFs above realized historical return volatilities.