Great post by Dan Blank on publishing and the Godfather!
One interesting example, as usual, is Apple. They created entire economies around their products that encouraged new companies and new products to come into being. Their App Store is indicative of this – it is a new form of marketplace. Apple even designs their gadgets with tons of room for third-parties to develop accessories for them, such as iPhone cases. It’s as if Apple deliberately designs products that are easily scratched or shattered, and offers incredibly poor cases of their own, specifically so that third parties can offer “solutions” and inventive cases and accessories.