Psychology
The Psychology of Persuasion: Principles of Influence in Social Contexts
Quick fact
A classic study found that a simple 'because' followed by a reason—even a trivial one—increases compliance by over 30%.
Why this is interesting
Have you ever bought something you didn't need because a salesperson said 'only a few left'? Why do we say 'yes' so often, even when we don't want to?