In the first chapter, I develop a representative agent model in which the purchase of consumption goods must be planned in advance. Volatility in the agent's portfolio increases the risk that a purchase cannot be implemented. This implementation risk causes the agent to make conservative consumption plans. In the model, this leads to persistent and negatively skewed consumption growth and a slow reaction of consumption to wealth shocks. The model proposes a novel explanation for the negative relation between volatility and expected utility. In equilibrium, prices of risky assets must compensate for the utility loss. Hence, the model suggests a new mechanism for generating the equity risk premium. Importantly, because implementation risk does not rely on the co-movement of asset prices with marginal utility, the resulting equity premium does not require concavity of the intratemporal utility function.

In the second chapter, I challenge the view that equity market timing always benefits

shareholders. By distinguishing the effect of a firm's equity decisions from the effect of mispricing itself, I show that market timing can decrease shareholder value. Additionally, the timing of equity sales has a more negative effect on existing shareholders than the timing of share repurchases. My theory can be used to infer firms' maximization objectives from their observed market timing strategies. I argue that the popularity of stock buybacks, the low frequency of seasoned equity offerings, and the observed post-event stock returns are consistent with managers maximizing current shareholder value.