Bishop, Fitzsimmons and Officer's paper in JASSA: The Finsia Journal of Applied Finance (Issue 1, 2011) proposes a method for adjusting the market risk premium (MRP) based on the implied volatility derived from prices of three-month and 12-month call options on the ASX 200. while it is widely recognised that the M RP was higher during the global financial crisis (GFC), there are some significant issues with the authors' proposed method of quantifying this variation which are identified in this response.