' I Iub '1th lllll (Complusory) Two fourth year students, Nairobi and Arturo, have been given an assignment by their Professor. This assignment should be done by both students and it should be submitted at the end of the semester. It is important for the team (Nairobi and Arturo) to score at least 60% to be guaranteed of graduating (hence, the project is at stake). a) Describe scenarios where an externality might occur between the students. (2 marks) b) How can norms arise from the externality in (a)? (4 marks) c) Using this scenario, describe how trust arises in an assurance game. (4 marks)