One of the most expensive business school is finally receiving AACSB accreditation, Johns Hopkins Carey Business School (US-MD). Recently Accredited AACSB Business Schools
I sometimes wonder why schools like Harvard & Johns Hopkins even bother with voluntary specialized accreditation. It's not like someone with a Harvard MBA is going to to get passed over in favor of someone with an MBA from Podunk State University because Podunk is AACSB and Harvard is not.