Claude Steiner, author of "Scripts People Live" describes power struggles and maintains that there are two reasons people attempt to use power against others and two kinds of power which can be utilized to bring others under one's control.
When transactional analysts talk about a "discount", they are not talking about getting something cheaper. They are referring to something much more insidious. A discount in TA is a way of denying some part of another person and, unfortunately, discounts are quite common in most of our lives.