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.

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.