People fear losing something more than gaining equivalent value
Definition
The psychological principle that people feel the pain of losing something twice as strongly as the pleasure of gaining the same thing. Users are more motivated to avoid losses than to acquire gains of equal value.
Do
Frame benefits in terms of what users will lose without them
Provide clear warnings before destructive actions
Offer to save or backup important user data
Emphasize existing investments when preventing churn
Avoid
Delete user data without clear warnings
Remove features without explaining alternatives
Make it easy to accidentally lose progress or content
Focus only on gains without acknowledging potential losses