Soft and hard capital rationing

Sir there is a past exam question for 5 marks that discuss the reasons why investment finance may be limited even when a company has attractive investment opportunities available to it?

Sir will writing the below answer will be sufficient or will we have to explain further?

Theoretically a company should invest in all projects with a positive NPV in order to maximize shareholder wealth. If investment finance is limited for reasons outside a company it is called hard capital rationing.If investment finance is limited for reasons within a company it is called soft capital rationing.