?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=The+bargaining+model+of+depression&rft.creator=Hagen%2C+Edward+H&rft.subject=Evolutionary+Psychology&rft.subject=Clinical+Psychology&rft.subject=Social+Psychology&rft.description=Minor+depression%E2%80%94low+mood+often+accompanied+by+a+loss+of+motivation%E2%80%94is+almost+certainly+an+adaptation+to+circumstances+that%2C+in+ancestral+environments%2C+imposed+a+fitness+cost.+It+is%2C+in+other+words%2C+the+psychic+equivalent+of+physical+pain.+Major+depression+is+characterized+by+additional+symptoms%E2%80%94such+as+loss+of+interest+in+virtually+all+activities+and+suicidality%E2%80%94that+have+no+obvious+utility.+The+frequent+association+of+these+severe+and+disabling+symptoms+with+apparently+functional+symptoms+like+sadness+and+low+mood+challenges+a+functional+account+of+depression+as+a+whole.+Given+that+the+principle+cause+of+major+unipolar+depression+is+a+significant+negative+life+event%2C+and+that+its+characteristic+symptom+is+a+loss+of+interest+in+virtually+all+activities%2C+it+is+possible+that+this+syndrome+functions+somewhat+like+a+labor+strike.+When+powerful+others+are+benefiting+from+an+individual%E2%80%99s+efforts%2C+but+the+individual+herself+is+not+benefiting%2C+she+can%2C+by+reducing+her+productivity%2C+put+her+value+to+them+at+risk+in+order+to+compel+their+consent+and+assistance+in+renegotiating+the+social+contract+so+that+it+will+yield+net+fitness+benefits+for+her.+In+partial+support+of+this+hypothesis%2C+depression+is+associated+with+the+receipt+of+considerable+social+benefits+despite+the+negative+reaction+it+causes+in+others.+&rft.publisher=MIT+Press&rft.contributor=Hammerstein%2C+Peter&rft.date=2002&rft.type=Book+Chapter&rft.type=PeerReviewed&rft.format=application%2Fpdf&rft.identifier=http%3A%2F%2Fcogprints.org%2F2471%2F1%2Fdepression.pdf&rft.identifier=++Hagen%2C+Edward+H++(2002)+The+bargaining+model+of+depression.++%5BBook+Chapter%5D++++(In+Press)++&rft.relation=http%3A%2F%2Fcogprints.org%2F2471%2F