I think they address this in a discussion about lacking full information. "We don't have an objective or preexisting sense of what makes for a good or bad appl

I think they address this in a discussion about lacking full information. "We don't have an objective or preexisting sense of what makes for a good or bad applicant; moreover, when we compare two of them we know which of the two is better, but not by how much." (p. 18) They then go on to explain stopping thresholds in the cases when you do have full information.