Suppose your friend is currently a nursing major. She decides she wants to switch her major to economics, but she would lose many of the college credits she has already earned. Explain to her why the past college credits should not be figured into her

marginal benefit and marginal cost calculation.

Please provide the best answer for the statement.

You should tell your friend that the previous courses she took in the nursing field are sunk costs. She has fallen into the sunk cost fallacy. She is putting weight on a previous purchase when those costs are in the past and should not be considered in making her decision. She should weigh the future expenses of the remaining years of nursing school with the economics program and the benefits of both to determine which is the best decision.