How One Word Lifted Compliance by 93 Percent

The Copywriting Podcast with Fexingo: Sales Letters, Headlines, and Persuasive Writing · Jul 26, 2026 · 5m · transcript

In 1978, psychologist Ellen Langer conducted a famous experiment at a library copy machine. She found that adding the word 'because' to a request—even with a trivial reason—boosted compliance from 60% to 93%. In this episode, Lucas and Luna unpack the psychology behind that word and show how copywriters can use the 'because heuristic' to write more persuasive headlines, subject lines, and calls to action. They break down real-world examples from email marketing and landing pages, and explain why the word itself—not the reason—triggers automatic agreement. If you've…