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There was an experiment in which researchers divided college students into two groups and asked them to independently solve complicated math problems.
During the experiment, students had a ten-minute break.
In the end, the experiment discovered that the rewarded group of students spent less time on the problems during the break while the unrewarded group was more interested in solving problems.
You might be surprised by the result of this experiment, but whether you believe it or not, it is a fact: rewards will decrease people's internal motivators and people's passion and interest in doing things.