Peggy's use of foul language decreased because it was followed by the loss of her $5 weekly allowance. taking away peggy's allowance served as for her foul language.

negative punishment                

Explanation:

In psychology, according to the concept developed by B. F. Skinner, there are two types of punishment i.e, negative and positive punishment.

Punishment refers to the phenomenon that leads to decrease a few unwanted behaviors carried out by an organism.

Negative punishment: The term negative punishment refers to the phenomenon in which a particular object, something good, or something desirable is being taken away from an individual to reduce the likelihood of occurrence of a specific behavior.

In the question above, taking away Peggy's allowance served as a negative punishment for her foul language.

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