dalillama
theacademist
Booth is trying to preserve their BusinessWeek #1 ranking.
FTFY
Except that in the BusinessWeek ranking selectivity and yield are not factored in--it's strictly a satisfaction survey (both student and recruiter) with an "intellectual capital" componenent (into which the GMAT average does not factor).
My opinion, having seen the admit numbers, is that we have a sample bias here. The admit numbers seem geared towards a yield of about 65%. If your yield is higher than anticipated, your waitlist would be smaller than normal, not larger. The same sample bias could be happening with the Wharton WL which everyone thinks was also larger than normal. Unfortunately I have no insights into that one.
The assumption you are making here is that the high yield will stay through to the end of this year's cycle. If Booth is excepting many candidates to withdraw from the school in favor of another school, it makes sense for them to have a decent sized waitlist.
I am hearing that Booth moved it's deposit deadline up - much earlier than peer schools. Thus, those admitted are much likelier to hedge their bets by putting a deposit down and waiting to see what the other schools say.
I've said it before, and I will say it again: I don't think a school's yield can jump 15% is just one calendar year. I think it will level out as we progress through the rounds.
As for whether or not they are using the wait list to manipulate selectivity, I think that this is unlikely. Acceptance rate accounts for only 1.25% of the US News score. If they got a perfect selectivity score, and if all of the other factors stayed the same, then the most they could increase to is 93.25, which is close to Wharton. However, that assumes their current score is the opposite end of the spectrum when it is closer to the middle (they are already getting some credit for selectivity).
So, if they managed to manipulate their selectivity to be around that of Stanford, they would move from getting 50% of the 1.25% to 100% of the 1.25%, and they could only move up to about 92.625, which isn't enough to put them ahead of Wharton. They could, at best, tie them.