年报问询函监管不仅涉及被问询企业，也涉及包括审计师在内的中介机构。在会计师事务所内部质量控制、学习效应和声誉机制的作用下，年报问询函监管可能通过联结被问询企业和其他企业的共同审计师而在事务所内部和外部产生相应的监管治理效果。 .本项目拟从年报问询函监管的溢出效应入手，运用会计师事务所内部的质量控制、学习效应和声誉机制来研究共同审计师(同所、同分所、同团队以及同签字审计师个人四个层次)对年报问询函的应对行为并评价其效果。以期厘清：在被问询企业年报问询函的外生冲击下，共同审计师是否会对其它风险较高客户采取辞聘、内部轮换、收费调整、审计延迟、关键审计事项披露变化以及非标审计意见出具等风险规避行为；采取这些行为是否达到降低其它客户被问询概率以及提高其它客户之间会计信息可比性等预期效果。.本项目将打开会计师事务所内部治理的黑箱，对审计行业监管研究有重大突破，同时为年报问询函监管也提供一新的研究范式。

Comment letters issued by stock exchanges affects both commented companies and auditors. Auditor behaviors will change in response to comment letters, which in turn affect their clients other than commented firms. This project is about the spillover effects of comment letters via common auditor. ..This project focuses on internal quality control of audit firms, learning effects among colleagues, and reputation incentives of auditors. The spillover effects are thoroughly examined via common audit firms, common audit office, common audit team, and common partner. Research topics include client-auditor match, audit fee, audit delay, key audit matter, and audit opinion from perspectives of auditor behavior, and probability of following comment letter and financial statement comparability...This project contributes to the growing literature about regulatory effects of comment letters, and helps improve our understanding about the internal governance within audit firms.