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Accounting Rate of ReturnThe accounting rate of return is an alternative evaluative tool that focuses on accounting income rather than cash flows. This method divides the average annual increase in income by the amount of initial investment. For Mirage's project above, the accounting rate of return is 13% ($19,500/$150,000). The accounting rate of return is simple and easy. The decision rule is to accept investments which exceed a particular accounting rate of return. But, the method ignores the time value of money, the duration of cash flows, and terminal returns of invested dollars (e.g., notice that Mirage plans to get the $100,000 back at the end of the project). As a result, by itself, the accounting rate of return can easily misidentify the best investment alternatives. It should be used with extreme care. Internal Rate of ReturnThe internal rate of return (also called the timeadjusted rate of return) is a close cousin to NPV. But, rather than working with a predetermined cost of capital, this method calculates the actual discount rate that equates the present value of a project's cash inflows with the present value of the cash outflows. In other words, it is the interest rate that would cause the net present value to be zero. IRR is a ranking tool. The IRR would be calculated for each investment opportunity. The decision rule is to accept the projects with the highest internal rates of return, so long as those rates are at least equal to the firm's cost of capital. This contrasts with NPV, which has a general decision rule of accepting projects with a "positive NPV," subject to availability of capital. Fundamentally, the mathematical basis of IRR is not much different than NPV. The manual calculation of IRR using present value tables is a true pain. One would repeatedly try rates until they zeroed in on the rate that caused the present value of cash inflows to equal the present value of cash outflows. If the available tables are not sufficiently detailed, some interpolation would be needed. However, spreadsheet routines are much easier. Let's reconsider the illustration for Greenspan. Below is a spreadsheet, using an interest rate of 8.8361%. Notice that this rate caused the net present value to be zero, and is the IRR. This rate was selected by a higherlower guessing process (trying each interest rate guess in cell C7). This does not take nearly as many guesses as you might think; with a little logic, you can quickly zero in on the exact correct rate. Payback MethodThe payback method could be called "investment decision making for dummies." It is a popular and easy method, and can be valuable when the key investment goal is to find projects where the initial investment is quickly recovered. But, it is not very strong in otherwise pinpointing the best capital investment decisions. Payback is calculated by dividing the initial investment by the annual cash inflow. The earlier illustration for Greenspan has a payback of approximately 3.9 years ($500,000/$128,000 = 3.9). If an investment involves uneven cash flows, the computation requires scheduling cash inflows and outflows. The payback period is the point at which the cumulative net cash inflows begin to exceed the cumulative net cash outflows. The method is deficient in that it does not take into account the time value of money. It also fails to reveal what happens after the payback period. For example, some investments may payback rapidly, but have little residual cash flow after the payback period. Other investments may take years to payback, and then continue to generate future returns for many more years to come. Although the investment with the shorter payback may be viewed as favorable, it could easily turn out to be the worst choice. All in all, be very cautious using the payback method for making business decisions. ConclusionCapital budgeting decisions are not much different than the whole of managerial accounting. There are many tools at your disposal. You should understand these tools and how to use them. But, in the final analysis, good decision making will be driven by your own reasoned judgment. 
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