The decrease in intrinsic motivation when external rewards are provided for activities that were previously intrinsically motivating.
From 'over' + Latin 'justificare' (to make just) + 'effect.' Over-justifying behavior with external rewards.
The overjustification effect is when paying someone to do what they already love actually KILLS their love for it — the reward replaces the joy as the reason for doing it.
Complete word intelligence in one call. Free tier — 50 lookups/day.