Is it really common that members who are dropped this way can simply be replaced? Aren't most chapters above total a little bit most of the time so that they can't just COB when they lose a few members?
I tend to think that this kind of attrition is what explains the size difference among groups that make quota at schools where most chapters are above total.
I also think that some chapters that end up with more members from "social prominent" families are less likely to have members willing to say to the chapter that they can't afford their dues. So while all chapters may have MIA members, some chapters have a higher ratio of MIA members who are still paying dues and remaining on roll.
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