I don't want to speak to all of the provisions in competition law, but if you are referring to the consent that is used in merger cases, remember that the competition commissioner does not have all of the relevant information when he or she decides to sign a consent agreement with the parties. The purpose of the Competition Act is to determine whether the merger would lead in the future to a significant decrease in competition.
In the context of the Competition Act, it seems important to allow the commissioner or another party to ask for an amendment if the circumstances change in a way that was unpredictable when the agreement was signed. Here, when Transport Canada signs a consent agreement, the facts are established, and this allows each party to make the best decisions and to see what they will give up during negotiations that are appropriate, in the context of safety.