The public would look at the US News rankings and call the unranked programs "unknown" to them:
http://grad-schools.usnews.rankingsandreviews.com/best-graduate-schools/top-economics-schools/rankings
Not sure if 100+ is meaningful when that's just about all of the programs that exist. The NRC is supposed to have a new list coming out, and we should see some surprises compared to this old one:
http://www.stat.tamu.edu/~jnewton/nrc_rankings/area36.html