The teacher understands how children learn and develop, and provides learning opportunities that support their intellectual, social, and personal development. Extrinsic motivation should be used in schools to motivate the students to do their best. The teachers should used extrinsic motivation in a positive way. For instance, if a student does not receive a reward the teacher should encourage the student to try again. I agree with Kohn that some students get discouraged when they see other students get reward.
Extrinsic motivation can effect a child for life.
Some students might have the urge to quit school or misbehave.