Dividend Innovations and Stock Price Volatility

Kenneth West ()

Econometrica, 1988, vol. 56, issue 1, 37-61

Abstract: A standard efficient markets model states that a stock price equals the expected present discounted valu e of its dividends, with a constant discount rate. This is shown to i mply that the variance of the innovation in the stock price is smalle r than that of a stock-price forecast made from a subset of the marke t's information set. The implication follows even if prices and divid ends require differencing to induce stationarity. The relation betwee n the variances appears not to hold for some annual U.S. stock-market data. The rejection of the model is both quantitatively and statisti cally significant. Copyright 1988 by The Econometric Society.

Date: 1988
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