In a model in which risk-averseasset holders with infinite planning horizons maximise expected utility, the product of a stock's price and the marginal utility of consumption satisfies a first-order linear expectational difference equation that has an eigenvalue greater than unity and a stochastic forcing term that reflectsthe expected evolution of the stock'sdividends. In this model, the market-fundamentalscomponent of the stock price is defined to be the particular solution 'to this expectational difference equation that equates the product of the stock price and the marginal utility of consumption to the expected presentvalue of the productsof futuredividends and future marginal utilities of consumption.