Google and Search-Engine Market Power

To Columbia workshop readers: As you will see, this paper is a preliminary draft, and somewhat out-of-date now, because although I wrote it some months ago, I have worked little on it since. The approach that I propose for measuring Google’s power is interesting, I think, but I believe the greater value of the paper is in its identification of some difficult and important problems in the antitrust analysis of information products. I look forward to your comments.