What is the opportunity cost in each of the following situations? You do not need to explain your answer, but you should be as precise as possible.
"I have an option between three jobs: I can work as a professor and make $150,000 per year, I can work as a consultant and make $200,000 per year, or I can work as an investment banker and make $300,000 per year. If I choose to work as a professor, and I only care about money, what is my opportunity cost?"