任何制度优势都只能是一定时空条件下的“比较制度优势”，若将一种制度模式在一定时空条件下的比较优势理解为恒定优势，就极易导致制度僵化与制度惰性。
Since any structural advantage is a comparative one in a certain space-time, if it is misunderstood as invariable, it will probably lead to structural rigidity and inertia.
从医疗优势计划的经验中我们已经明白，与现行体制比较，代金券制度只会提高而不是降低费用。
And we already know, from experience with the Medicare Advantage program, that a voucher system would have higher, not lower, costs than our current system.
进而论证了以让与担保理论构建倒按揭制度的比较优势。
Subsequently the author demonstrates the comparative advantage for construction of the reverse mortgage system under alienation guarantee theory.
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