what is the decision rule for a discounted payback period 
the decision rule is a simple rule to determine if an investment is worthwhile and which of several investments is most worthwhile if the discounted payback period for a certain asset is less than the useful life of that asset the investment may be approved if a business is choosing between several potential investments the one with the shortest discounted payback period will be the most profitable the bottom linethe discounted payback period is a simple metric to determine if an investment will be sufficiently profitable to justify the initial cost it uses the predicted returns from the investment but also takes into consideration the diminishing value of future returns 