“Murder on the 'Margin'.” Marginal thinking is a fundamental economic principle. It has very little effect and a small part in the plot but is mentioned in the title. It refers to the decision to add one more at a time: “Would it benefit me to add another?” “If I added one more, would it be too much?” “What if I took one away?” These questions are questions one would ask when thinking peripherally. Probably one of the biggest economic debates is rationality. Whether a decision is rational or irrational. If I were to make a rational decision, it would benefit me more than all the other choices I could have chosen from. This is how Professor Henry Spearman solves the murder case. All suspects are proven guilty or innocent based on the decisions they make. If it is a rational decision, the suspect is considered innocent. If it is an irrational decision, then the suspect is thought of
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