螺旋状的
It also needs effectual in spiriting and inhibiting system inside.
同时也需要内部有效的激励和约束机制.
However, the incompletely contract is the general rule in the real economic life, so that the full-in spiriting contract is inexistence.
但契约的不完全性是现实经济生活中的普遍规律,全面激励合同是不存在的。
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