MITChris has commented on this several times. Here’s once instance:
http://talk.collegeconfidential.com/discussion/comment/14538472/#Comment_14538472
Our process is a student-centered process, not a school or region centered process. This means that we do not read your application along with other students from your school or region to compare you against each other; each applicant stands on their own. We have no quotas by school, state, or region. You are not at any disadvantage if other excellent students from your school or area are also applying.