For this discussion I'd like you to think about when you have let irrelevant costs (or revenues) influence your decisions in your experience at home, at work, etc. Likely the most common example of this might be if you let a sunk cost influence a decision you have made for the future. What irrelevant information did you consider? Did the irrelevant information influence your decision? If so, how? How might you approach the decision making process differently in the future