Mind & Psychology•May 15, 2025•1 min read

The Ben Franklin Effect: Make Enemies into Friends

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Benjamin FranklinContributor

The Rare Book Trick

Benjamin Franklin had a rival legislator who hated him. Franklin didn’t try to be nice. Instead, he asked to borrow a rare book from the rival’s library. The rival, flattered, lent it. When Franklin returned it with a thank-you note, the rival became a lifelong friend.

Rationalizing Kindness

This works because of Cognitive Dissonance. Brain: “I did a favor for Franklin.” Brain: “I hate Franklin.” Conflict! Resolution: “I must not hate Franklin. In fact, I must like him, since I helped him.”

To get someone to like you, let them help you. It makes them feel invested in your success.

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Benjamin Franklin

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