Final answer:
If the firm were to borrow to invest, it would face an 8% interest rate, which is higher than the 6% return on the investment, leading to a net loss. However, since the firm has the cash, and hence no borrowing is needed, the investment's 6% return makes it profitable.
Step-by-step explanation:
When a company is considering an investment decision, it should compare the potential rate of return with the cost of any associated debt. In the scenario, a firm can potentially earn a 6% return on an investment. If the company were to take a loan to fund the investment, it would incur an 8% interest rate. However, as the firm currently has the cash available, it would not need to take on debt to make the investment.
Comparing the potential return of 6% with the avoided debt interest of 8%, we can see that if the firm were to borrow, the cost of the investment would be greater than the potential earnings, resulting in a net loss. But since the firm has the necessary funds, the investment offers a 6% return without incurring any interest costs. Therefore, the firm should proceed with the investment using its own funds, as it would yield a positive rate of return at 6%.
It's essential to always consider both the return on investment and the cost of capital when making investment decisions. In this case, using internal funds bypasses the higher cost of borrowing, making the investment a financially sound decision.