What makes this distinction particularly challenging is that the question as to what is anticompetitive and what is simply good business changes as a business scales. A small business can generally be as anticompetitive as it wants to be, while a much larger business is much more constrained in how anticompetitively it can act (as a quick aside, for the first part of this essay I am painting in broad strokes as far as questions of specific legality go). The specific case of Apple and the iPhone raises an additional angle: should the importance of the market in the question make a difference as well?