Final answer:
Peggy's method of penalizing her son by reducing his allowance for not making his bed is a form of Response Cost, which is a type of negative punishment intended to decrease undesirable behavior.
Step-by-step explanation:
Peggy penalizes her son $1 of his $20 per week allowance every day he fails to make his bed. This strategy is known as Response Cost, which is a principle of behavior modification falling under the category of negative punishment. In contrast to a time-out, where a child is removed from a desirable activity, or response blocking, where access to a response is physically blocked, response cost involves the removal of a positive reinforcer after an undesirable behavior has occurred. In Peggy's case, the positive reinforcer for her son is his weekly allowance, and the withdrawal of a portion of this allowance is intended to decrease the likelihood that he will repeat the behavior of not making his bed.