8. Which of the following statements is true of marginal cost of capital? a. All else equal, an increase in the tax rate would decrease the marginal cost of debt b. All else equal, an increase in a company's stock price will increase the marginal cost c. All else equal, an increase in a company's stock price will increase the marginal cost d. All else equal, an increase in the capital raised in a period will decrease the marginal e. All else equal, an increase in the weighted cost of capital will decrease the marginal capital. of retained earnings of issuing new common equity cost of debt capital. cost of retained capital