Your client is a corporation, Pros, who is working with another corporation, Cons, to build an office building downtown. Cons is a megacorporation and practically has a monopoly on construction materials and so has started to withhold timely delivery of materials in order to make new demands on Pros, like adding additional features that will cost Pros more in the end, and says things like, "take it or leave the entire project." Identify the defense of duress.