The market model is the more appropriate model given we are investigating one particular industry of the entire market. By removing the portion of the actual return that is attributable to variation in the market’s return, the variance of the abnormal return is potentially reduced. This can lead to an increased ability to detect event effects. For this reason, we emphasize the market model in the discussion of our empirical results. However, since our results are largely consistent across both estimation methods, we mention the other normal performance model results when relevant