The article discusses how to compare different investment projects to determine which one is better. They focus on projects with one-time costs and benefits spread out over time. The researchers use a method called the interest method to solve conflicts in ranking these projects. The main idea is to see if a project's net present value or internal rate of return is higher to decide which project is more profitable. The study shows that sometimes a project with a higher net present value may have a lower internal rate of return, and vice versa. The interest method helps in making the best decision when choosing between alternative investment projects.