Depression as a defense mechanism against slavery

Individuals who have to conform to an external authority too powerful to resist often get depressed: which among other effects, includes lower productivity and higher risk for suicide. This suggests one way how a tendency for depression, and resulting behaviors of akrasia and suicide, enhances survivability. After all, humans have always had to live with the threat of being conquered and subjugated by other tribes. A conqueror has a choice to kill a prisoner or to use them for labor. A prisoner who becomes depressed and thus poses a lower threat to the conqueror is more likely to be spared. However, survival as a slave is difficult if the master imposes too many hardships on the slave. Therefore, it makes game theoretic sense for a defense mechanism to exist which makes it undesirable for a master to make life too difficult for the slave, in the form of the effects of depression. The lowered productivity resulting from depression means that a master gets diminishing or negative returns from working his slaves harder. At an extreme, the risk of suicide means that a master who pushes his slaves too far risks losing them.

It would seem that such behaviors are less adaptive in civilized countries, where the risk of being enslaved is much lower. However, depression may still be of some benefit due to the fact that the master-slave relationship continues to exist, in diluted form, in hierarchical institutions.

What consequences would this theory of depression have for the goal of controlling akrasia? Firstly, it suggests that the individual experiencing an impaired ability to realize certain goals first ask themselves, “Are these goals really mine, or were they imposed by external authorities?” If so, perhaps being able to convince yourself that your goals are really what *you* want would help motivate you towards achieving them.