^ Not so sure about that, wayneandgarth. I’m persuaded that the total number of applications might be smaller with ED/RD than with EA/RD, but that doesn’t mean the acceptance rate would necessarily increase. It depends how many seats they fill out of the ED pool. Michigan can now be used as a kind of “safety” because of EA: anyone can apply EA without committing to attend until they’ve heard from all their other schools. So even if Michigan isn’t one of your top choices, there’s little reason NOT to apply EA, unless you just need more time to get your application together. On the plus side, you could know by December that you’re admitted to a very good school. On the negative side–well, there really isn’t one, since you’re making no commitments. They could reject you outright in the EA round, but then you at least have that information early, which is probably more valuable than having it late. More likely, though, they’ll defer you to the RD round, in which case you’re in no worse shape than if you had applied RD. And if they accept you, great! You then have that that acceptance in your back pocket, and you can wait to see what happens with the rest of your schools which could even include an ED or SCEA school that’s truly your first choice. So my guess is Michigan now gets many thousands of OOS EA applications and has a fairly low yield on its OOS EA admits, because that EA pool includes thousands of applicants for whom Michigan ranks fairly low on their wish list.
Full disclosure: my own daughter was one of these. She liked Michigan a lot, but it was maybe 7th or 8th on her list of preferences, the others all being LACs. She was disappointed to be deferred to the RD round then ultimately waitlisted at her ED school, but she was delighted and tremendously relieved to be admitted EA to Michigan; in fact she was so relieved that she almost decided to attend, but she decided to be patient and wait for RD results and was accepted at all the other schools she applied to, and enrolled at one. Multiply that by thousands and what do you get? A large EA applicant pool, yes, but a low yield and consequently a need to accept large numbers in the EA round.
Now switch from EA to ED and what happens? Well, you get fewer ED applications than you formerly got EA applications. But that’s OK, because the EA applications you’re losing are from the applicants least likely to accept an offer of admission. You then get close to 100% yield from those you admit from the ED pool, so you don’t need to admit that many–just enough to fill up 25% or 30%or 40% of the class, whatever your target is depending on the strength of the ED pool. There’s no reason the RD pool should shrink; in fact, it’s almost certainly bigger because some of those who formerly would have applied EA decide it’s still worth it to apply RD even if they’re not prepared to sign up for ED. So you’re now filling the remaining 60 to 75% of the class from a larger RD pool, with a yield probably similar to what you formerly got in the RD round.
Admit rate is a function of the number of applications you get, yield, and the number of seats you’re trying to fill. If your overall yield goes up substantially with EA (as it should), you can live with a somewhat smaller applicant pool without raising your admit rate.