Know Yourself and Know Your Enemy: An Analysis of Firm Recommendations and Consumer Reviews in a Competitive Environment

R ev ie w E ffe ct i,t -1 Positive Review Volume Cumulative count of positive reviews posted to the focal book up to time t-1 Negative Review Volume Cumulative count of negative reviews posted to the focal book up to time t-1 Positive Helpful Vote Ratio of Helpful vote to Total vote for positive reviews posted to the focal book up to time t-1 Negative Helpful Vote Ratio of Helpful vote to Total vote for negative reviews posted to the focal book up to time t-1 Review Rating Average Average review rating posted to the focal book up to t-1 Review Rating StdDev Standard deviation of review ratings posted to the focal book up to t-1