Why does the NPV of a long-term project, defined as one for which a high percent

Why does the NPV of a long-term project, defined as one for which a high percentage of its cash flows are expected in the distant future, is more sensitive to changes n the cost of capital than is the NPV of a short-term project?
Why should sunk costs not be included in a capital budgeting analysis but opportunity costs and externalities be included? What is meant by the term “self-supporting growth rate?” How is this rate related to the AFN equation, and how can that equation be used to calculate the self-supporting growth rate?
What are some actions an entrenched management might take that would harm shareholders?