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This study found that the equity value during a period is a function of (1) the time-series persistence of the earnings series, (2) the interest rate used in discounting expected future earnings, and (3) the relative ability of earnings versus alternative information to predict future earnings. The comparative statistics of Lipe (1990) showed that the response coefficient played an increasingly important role for past earnings to predict future earnings and an increasing function of persistence. In addition, the movements of stock price changed conditionally on earnings being announced was a decreasing effect of the predictability of the earnings series and an increasing effect of earnings persistence. If the predictability or response-coefficient effect was positive, that was because the value attached to a one-dollar current-period earnings shock was an increasing effect of predictability; if the predictability or variance-of-price-changes effect was negative, that was because the average quantity of unexpected information released during the period was a decreasing effect of predictability. Other studies refined the earlier studies by disintegrating earnings into components and then empirically testing the association between these components and equity values


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