老师 可以讲解下这题吗 g ，以及这道题相关的讲义

问题如下：

Stack asks Armishaw if it is true that the sustainable growth model assumes the company will require:

1. external debt financing,

2. external equity financing, and

3. improving return on equity.

Which of Stack's three assumptions regarding the sustainable growth rate model is most accurate?

选项：

A.

1

B.

2

C.

3

解释：

The sustainable growth rate model assumes that the growth will be financed with the issuance of debt and only internally generated equity will be used to maintain a target capital structure. No additional common equity will be issued. The ROE is assumed to be a constant during this period.