股東價值函數意指公司未來預期股利的加總，其模型主要利用擴散過程來建構。因為公司可透過保留現金和發放股利兩大策略來調控公司價值－－過多現金保留將產生現金邊際效益降低；現金保留過少則會產生流動性風險甚至破產問題。論文主要探討公司在捨取現金保留時如果達大公司價值的極大化，並利用實際資料來檢視上市公司的價值是否有高低估之嫌。此外，亦在論文中提供以股東價值函數為評價方式的交易策略。 / We consider a problem of finding the optimal solution for maximizing the value of a firm in a stochastic environment. In the paper, we apply a methodology that determines a corporate value by using cash reserves as the main variables. We examine the model by employing two empirical approaches to compare the corporate value computed from the model to the market value. We find that there are slight differences between the stock value and shareholder value. Therefore, we may use the facts that we find to construct optimal trading strategies to exploit small price differences.