When a neighbor asks if he can borrow your chemistry textbook and you do him this favor,dissonance theory would predict that you will like him more due to the Ben Franklin effect,which works because

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Dissonance theory predicts that we experience discomfort when our beliefs and behaviors conflict, and we seek to reduce this discomfort by justifying our actions to ourselves. In this case, lending the chemistry textbook is a behavior that conflicts with any negative beliefs or feelings we may have had towards the neighbor. Thus, we may internally justify our behavior by convincing ourselves that we actually like the neighbor more than we thought. This is known as the Ben Franklin effect.

When a Neighbor Asks If He Can Borrow Your Chemistry