求一道作文思路， 望解答，谢谢。

“Eight years ago, our firm’s profits were increasing with each new employee we added. We discovered that each employee had the skills and motivation to generate more revenue for the firm than his or her salary cost us.
However, for the past two years, our profit margin has been falling, even though we have continued to add employees. Thus, our newer employees are not generating enough revenue to justify their salaries. We must not be hiring new employees with the same level of skills and motivation as those we used to attract. Clearly, then, failures in the human resources department account for our falling profits.”

我能想到是oversimplification: 即这个公司的利润下降和其它因素有关， 不一定是员工造成的， 还有其它吗？

谢谢

All things are equal:8年前的经验到现在不一定适用了。

Gratuitous assumption:假设增加员工的skills。。。 一定与revenue有关

其实这个好像都和causal oversimplification相关，但是每个谈一点还是可以的吧！