In a model of Hierarchical Agency, collusion exists between supervisor and agent, and they are for their own benefit achieve ments tacit understanding, thus it causes principal benefit to suffer injury.

• 摘要在层级代理模型中，存在着监督人与代理人共谋问题，监督人和代理人为了自己利益达成的默契，从而导致委托人的利益受损。