The Over Justification effect states that users might lose intrest or quit an activity when they have been rewarded for it.

An example of this in the real world is when users redeem a loyalty rewards card, they lose motivation for the store or the business.

You can utilize this effect in your designs by having a gamification system. Don't give users short term reward rather provide long term gains. For instance always provide a way to keep increasing and getting more rewards

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