Missed opportunities vs. poor execution

When you think back to the last ten years of your career or your company's history, how much of what you haven't achieved is due to missed opportunities (the product you didn't launch, the service you didn't choose to do, the effort you didn't extend, the stock you didn't buy) and how much is the result of doing your assigned tasks poorly?

____ % missed   vs.  ____ % incompetence

Now, compare those percentages to where you spend your time, your focus and your anxiety.