Peter: One counter-intuitive idea the monopoly question always leads me to is that you want to start with a small market. Then, take over that market and somehow grow over time. The most common mistake that is made by businesses is to go after markets that are too big. This, in my experience, is especially acute on the consumer side of things. Everyone seems to be trying to go after enormously big markets. We need to remember that there are more niche, ownable markets in the enterprise space.
Start small and grow crazy. Nothing else matters.