結果發現，當障礙負債比率增加時，會造成權益報酬及違約風險機率增加。另一方面，政府加強資本管制程度時，反而會引起金融體系的不穩定，本論文將建議銀行回歸市場力量運作的機制。 This paper examine a down-and-out call option pricing model to conduct the market value of bank interest margin and its default probability in equity return, especially triggering default prior to the maturity. Through changes in the barrier-to-debt ratio into interest margins and in its exposure to the ratio, we can use the information to manage risk. However, the government has capital regulation in order to maintain the asset equity of the banking firms, and we also discuss the effect on equity return and its default probability when it changes.
This study shows that when the barrier-to-debt ratio increases the return of bank has higher interest margin and default risk in equity return. In the other hand, an increase in bank capital requirement will result in financial instability. That the invisible hand theory is applied to banking risk management.