Evaluation of Investment Alternatives with Different Life Times

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In the comparative study of investment alternatives with different life times. It is wrong to compare a long-life time alternative with different life times. It is to wrong to compare a long-life time alternative with a short-life time one by the same measure; therefore, a measure is needed which is suitable for the characters of alternatives. The purpose of this study is in present a method to evaluate investment alternatives with different life times and to explain the assumptions and calculating method.