Titlebook: Building Economics: Theory and Practice; Rosalie T. Ruegg,Harold E. Marshall Book 1990 Springer Science+Business Media New York 1990 Termi

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Benefit-to-Cost Ratio (BCR) and Savings-to-Investment Ratio (SIR)vestment costs, divided by investment costs.. The SIR is savings divided by investment costs. The SIR is the BCR method recast to fit the situation where an investment’s primary advantage is lower costs. SIR is to BCR what NS is to NB.

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Setting the Study Periodlution. In this section we state the criterion for setting it, identify factors which determine its length, give examples of setting study periods under a variety of circumstances, discuss the need for replacements and residuals, and, in summary, provide a set of guidelines.

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Selecting a Discount Rate or MARRcause it affects whether a project will be accepted or rejected and how much will be spent on it, the value of the discount rate is a key ingredient in an economic evaluation. If it is set too high, some projects which are economic will be rejected; if too low, some projects which are uneconomic will be accepted.

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Risk Exposure and Risk Attitudeues, and other factors that affect project economics. Since the exact values of these variable factors are usually unknown, it is difficult to make economic evaluations with a high degree of reliability.

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Mathematical Formulas for Economistses the amount of net benefits from investing in a candidate project instead of investing in the foregone opportunity. NB is computed by subtracting the time-adjusted costs of an investment from its time-adjusted benefits. If NB is positive, the investment is economic; if it is zero, the investment i

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Mathematical Formulas for Economistsvestment costs, divided by investment costs.. The SIR is savings divided by investment costs. The SIR is the BCR method recast to fit the situation where an investment’s primary advantage is lower costs. SIR is to BCR what NS is to NB.