It is your first day of your summer internship at PWC, the PWC partner that is mentoring you suggest that you go along with the team to a client meeting. The client is the CFO of a large company and wish to know how to manage interest rate risk. You remembered the TFS lecture notes and wishing to make an impression suggested that a plain vanilla interest rate swap can help the company to lock in an interest rate for its debt. The client is very happy with this idea but is concerned about the costs of entering into a swap. Can you explain to him why parties can enter a plain vanilla interest rate swap without paying for the privilege?