Because of the opportunity cost. How does MM's parachute compare to 1) what she could have made as a CEO at other companies with more stable businesses, or 2) b

Because of the opportunity cost. How does MM's parachute compare to 1) what she could have made as a CEO at other companies with more stable businesses, or 2) by simply staying at Google and enjoying her squeaky clean reputation. What she negotiated with Yahoo is likely a result of the market forces that existed at the time of her hire, and those market forces look different today. If the deal she negotiated was fair, the delta equals her parachute amount.