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" ... Guaranteed Rewards. A vast body of psychological research demonstrates that giving people rewards independent of what they do does not yield beneficial outcomes. These studies deal with a phenomenon known as the overjustification effect which, simply stated, refers to the fact that external incentives to perform a task –promises of money, prizes, awards— are often deleterious to performance. Actually, holding out guarantees of remuneration for engaging in tasks induces people to generate less creative and lower quality outputs. This finding is counter-intuitive, but has been replicated countless times in a variety of contexts. ... "