No Competition Between Open and Closed Source?

techie writes "MadPenguin.org is highlighting the lack of competition between open and closed source applications. The author writes, 'Is there really the level of competition in the open source world that we see in the closed source world? This is something that has been stuck in my mind lately as I have been told so many times by closed source developers that by opening the code you are creating your own competition. Today, I'm here to explore this theory and hopefully prove why it's false.'"