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农机经济寿命的计算关系到企业的经济效益。相对收益率法优于收益最大法，收益最大法优于费用最小法；动态方法优于静态方法；解析法优于列表法。站在系统全局角度来考虑机器更新换代时，所计算的机器寿命并不是经济寿命，而应称为社会寿命。机器的社会寿命是没有现实意义的。
The calculation of agricultural economic life is related to the economic benefits of the enterprise. The relative return method is superior to the maximum return method, the maximum return method is better than the minimum cost method; the dynamic method is better than the static method; the analytical method is better than the list method. From the perspective of the system to consider the replacement of the machine, the calculated life of the machine is not the economic life expectancy, but should be called the social life expectancy. The social life of the machine is not realistic.