Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
This article proposes a simple approach to analyzing profit dynamics, which allows for time‐varying persistence of profits. The time series model is a simple autoregressive process where the dynamics of the persistence parameter follow an autoregressive process. Using the longest time series available on profits for more than a hundred U.S. firms, we find that there is ample evidence of time variation in the persistence parameter. (JEL L00, C22)