Question

McCullough and Emmons (2001) contend that gratitude is the glue of cooperative social living among non-kin because gratitude ___

Answer 1

Gratitude is a moral emotion. It is the kind of emotion that will help us to measure who are generous friends and who is not that kind of person. Also, gratitude helps us to reinforce the long-term commitment among our friends and motivates our affectional behavior.