In the first chapter, I introduce investment timing options into the long- standing discussion regarding the relationship between corporate investment sensitivity to cash flow (ISCF) and financial frictions. I develop a dynamic, stochastic model in which firms possess an option to delay investment. My model predicts that a higher degree of financial frictions decreases ISCF by reducing firms’ borrowing capacity. Meanwhile, more financial frictions also increase the discount rates, encouraging firms to invest sooner rather than later; as a result, ISCF increases. Furthermore, I introduce uncertainty as an additional determinant of ISCF. Heightened uncertainty decreases ISCF as it enhances the option value of waiting for uncertainty to resolv...