What is underemployment define it .
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Underemployment is a measure of employment and labor utilization in the economy that looks at how well the labor force is being used in terms of skills, experience, and availability to work. It refers to a situation in which individuals are forced to work in low-paying or low-skill jobs.

Underemployment is a condition in which workers are employed in less than full-time or regular jobs or insufficient jobs for their training or economic needs. Also, underemployment is a worker's underuse because a job does not use the skills of the worker, i.e. part-time, or leaves the worker idle

the answer to the question is punishment. or more specifically, positive punishment.

positive punishment occurs when a behavior is given a negative consequence for the individual doing the behavior.

sara no longer wants to ask questions (the behavior) because she is ridiculed by mr. smith (the punishment).

reinforcement is inaccurate because reinforcement always gives positive consequences for the individual doing the behavior, be it by introducing a pleasant consequence or removing an unpleasant one.