第二个can修饰的后面的our reactions to the behavior of our friends.跟前面第一个can修饰a customer's mood一样.后面的CAN是倒装,你把句子的顺序变一下就容易明白了.
in one sence the effect of a customer's mood can be thought of,just like our reactions to the behavior of our friends can "ALSO" be thought of.