Do Beliefs Justify Actions or Do Actions Justify Beliefs? An Experiment on Stated Beliefs, Revealed Beliefs, and Social-Image Manipulation

We study whether actions are justified by beliefs, as is usually assumed, or whether beliefs are justified by actions. In our experiment, subjects participate in a trust game, after which they have an opportunity to state their beliefs about their opponent's actions. Subsequently, subjects participate in a task designed to "reveal" their true beliefs. We find that subjects who make selfish choices and show strategic sophistication falsely state their beliefs in order to project a more favorable social image. By contrast, their "revealed" beliefs were significantly more accurate, which betrayed these subjects as knowing that their selfishness was not justifiable by their opponent's behavior.