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Overjustification Effect
If users are being incentivised to complete a task, especially with money or 'rewards', they can be less motivated than they otherwise would be.
Similar psychology:
Last updated: 03/11/2026
How to utilise this in your designs
When someone hits a streak milestone, try rewarding them with a power feature rather than cash, so the reward feeds their interest in the product instead of replacing it.
Example from
Peerlist
To encourage contributions, e.g., writing reviews, you could award badges shown on their public profile, so people are recognised for it rather than paid per contribution.
Example from
Google
One option is to hide an unexpected bonus, like extra free trial time, at the bottom of a list of benefits, so it feels like a surprise, not a payment for signing up.
Example from
MacroFactor
When asking people to share something personal, like a yearly recap, consider offering a secret reward instead of a set cash amount, so sharing doesn't feel bought.
Example from
Duolingo
Possible impacts
Surprise bonuses, like extra trial time, may lift conversion without triggering the overjustification effect, as they feel like a gift rather than a payment to sign up.
Small cash referral fees can make sharing feel like putting a price on a friendship, so product or surprise rewards might lead to more genuine referrals.
If users come to expect a reward for every action, the overjustification effect means their effort could drop once the rewards stop.
Paying users to take part can make an activity seem worth only the reward, while product rewards, like premium time, could raise how much users value the product itself.
Written by Peter Ramsey
Published: