We love to return favors. Get a mint with the bill at a restaurant and tips go up by 4x. But does this well-known bias help with real marketing growth? In this show, I share how I convinced 140 people to give Nudge a 5-star review. How reciprocity optimized my £100 LinkedIn ad. And why someone left Nudge a one-star review. Sign up to the mailing list and get all the resources: https://astounding-thinker-8472.ck.page/4f1f9bdce9 The Science of Marketing Course: https://scienceofmarketing.teachable.com