問題:You are currently employed as a Management Accountant in an insurance company. You are contemplating starting your own business.
  In considering whether or not to start your own business, what would your current salary level be?
  A. An incremental cost
  B. An opportunity cost
  C. A sunk cost
  D. An irrelevant cost
  答案:The correct answer is: An opportunity cost
  An opportunity cost is the value of the benefit sacrificed when one course of action is chosen, in preference to another.