Our credit card approval rate dropped from 45% last week to 38% this week, and the risk manager is asking whether underwriting got tighter. Last week we had 10,000 applications and approved 4,500; this week we had 13,000 applications and approved 4,940. What's your read, and what do you check first?

信用卡申请审批通过率从上周的45%掉到本周的38%，风控经理问你是不是审批策略收紧了。上周申请1万笔、批了4500笔；本周申请1.3万笔、批了4940笔。你怎么看，第一步查什么？