The equity premium arises from the interaction between the atemporal risk p
remium for equity, the risk-free rate of intertemporal substitution and the
impact of risk on the precautionary motive for saving. Depending on parame
ter values, the equity premium may either be increased or reduced by the pr
esence of undiversifiable background risk. (C) 2000 Elsevier Science S.A. A
ll rights reserved.