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Here is a list of top universities and LACs sorted by the percent of expenses that are administrative in nature.

I did this calculation using IPEDS data:
Total Institutional Support Expenses divided by Total Expenses

The percentage indicates how "lean" the operation is. Are schools spending too much on administrative overhead? How efficiently are the schools run?

Are there "economies of scale"? Some of the schools with the least administrative waste are pretty small (e.g. Vanderbilt).

The most bloated schools are at the top.

Bennington College 27.9%
Thomas Aquinas College 27.4%
Spelman College 27.3%
Millsaps College 26.7%
Austin College 26.7%
Earlham College 26.2%
Pepperdine University 25.1%
Southwestern University 24.4%
Principia College 24.3%
Franklin and Marshall College 23.7%
Reed College 23.7%
Southern Methodist University 23.4%
Trinity College 22.6%
Hendrix College 22.3%
Agnes Scott College 21.7%
Sewanee: The University of the South 21.2%
Claremont McKenna College 21.2%
Wheaton College 20.8%
Wofford College 20.8%
Sweet Briar College 20.7%
Swarthmore College 20.7%
Randolph-Macon College 20.6%
Vassar College 20.3%
Knox College 20.0%
Ursinus College 19.8%
Macalester College 19.8%
University of Notre Dame 19.8%
Middlebury College 19.6%
Wellesley College 19.5%
Skidmore College 19.4%
Mills College 19.3%
Beloit College 19.2%
University of Richmond 19.1%
Connecticut College 19.1%
New College of Florida 19.0%
Marquette University 18.9%
Sarah Lawrence College 18.8%
Carleton College 18.7%
Albion College 18.6%
Centre College 18.6%
Hollins University 18.6%
Colgate University 18.5%
Dickinson College 18.4%
Lawrence University 18.3%
St Mary's College of Maryland 18.3%
Rensselaer Polytechnic Institute 18.2%
Davidson College 18.2%
Presbyterian College 18.2%
Birmingham Southern College 18.0%
Barnard College 17.7%
Harvard University 17.7%
Gettysburg College 17.6%
Illinois Wesleyan University 17.5%
College of Saint Benedict 17.5%
Juniata College 17.5%
Bryn Mawr College 17.1%
Williams College 17.1%
Hobart William Smith Colleges 17.0%
Hanover College 17.0%
Pitzer College 16.9%
Haverford College 16.8%
College of the Holy Cross 16.8%
Pomona College 16.8%
American University 16.7%
Boston College 16.6%
Whitman College 16.5%
Allegheny College 16.4%
Bowdoin College 16.3%
St Lawrence University 16.3%
Harvey Mudd College 16.3%
Wheaton College 16.2%
Saint Johns University 16.2%
Georgetown University 16.1%
Colby College 16.1%
Drew University 16.1%
Augustana College 15.9%
Colorado College 15.9%
Bates College 15.7%
Kenyon College 15.6%
The College of Wooster 15.5%
Brandeis University 15.5%
Lafayette College 15.5%
Lehigh University 15.4%
Bucknell University 15.2%
Muhlenberg College 15.2%
Grinnell College 15.1%
Wesleyan University 15.0%
Worcester Polytechnic Institute 14.8%
Hamilton College 14.7%
Union College 14.7%
Oberlin College 14.7%
Goucher College 14.6%
Brown University 14.6%
Fordham University 14.3%
Furman University 14.3%
Cornell University 14.3%
Occidental College 14.3%
Kalamazoo College 14.0%
Smith College 13.9%
Bard College 13.9%
Wabash College 13.8%
Willamette University 13.7%
Washington and Lee University 13.6%
University of Denver 13.6%
Amherst College 13.6%
Clark University 13.4%
Stevens Institute of Technology 13.1%
Indiana University-Bloomington 13.0%
Massachusetts Institute of Technology 13.0%
Baylor University 12.9%
Mount Holyoke College 12.9%
St. Olaf College 12.6%
Yeshiva University 12.5%
University of Puget Sound 12.2%
Rhodes College 12.2%
Wells College 12.0%
George Washington University 11.8%
Tulane University of Louisiana 11.7%
Northwestern University 11.7%
Denison University 11.6%
Tufts University 11.4%
Gustavus Adolphus College 11.4%
Princeton University 11.3%
Dartmouth College 11.3%
DePauw University 11.2%
Ohio Wesleyan University 11.2%
Syracuse University 11.2%
Case Western Reserve University 11.0%
University of Pittsburgh-Pittsburgh Campus 10.9%
Saint Louis University-Main Campus 10.6%
Wake Forest University 10.6%
University of Southern California 10.5%
Rice University 10.1%
Hope College 10.0%
SUNY at Binghamton 9.6%
Boston University 9.3%
Scripps College 9.3%
University of Delaware 9.1%
New York University 8.8%
Stanford University 8.7%
University of California-Riverside 8.7%
Miami University-Oxford 8.7%
Yale University 8.5%
Virginia Military Institute 8.3%
University of Connecticut 8.3%
Columbia University in the City of New York 8.1%
Duke University 8.0%
Purdue University-Main Campus 7.9%
Brigham Young University 7.8%
Auburn University Main Campus 7.7%
University of California-Berkeley 7.7%
College of William and Mary 7.6%
Rutgers University-New Brunswick 7.2%
University of Chicago 7.1%
Carnegie Mellon University 6.9%
Johns Hopkins University 6.8%
University of California-Santa Cruz 6.3%
University of Minnesota-Twin Cities 6.0%
Pennsylvania State University-Main Campus 6.0%
University of Florida 5.9%
The University of Tennessee 5.8%
University of Maryland-College Park 5.6%
University of Georgia 5.5%
University of Miami 5.3%
Virginia Polytechnic Institute and State University 5.2%
The University of Texas at Austin 5.1%
University of California-Santa Barbara 5.1%
Georgia Institute of Technology-Main Campus 5.0%
Washington University in St Louis 4.8%
Clemson University 4.8%
Emory University 4.6%
University of California-San Diego 4.5%
University of Washington-Seattle Campus 4.5%
Michigan State University 4.4%
University of Pennsylvania 4.3%
University of Colorado at Boulder 4.0%
Texas A & M University 3.9%
Ohio State University-Main Campus 3.8%
University of Virginia-Main Campus 3.7%
University of California-Los Angeles 3.4%
University of Iowa 3.4%
Iowa State University 3.3%
University of California-Davis 3.1%
University of Wisconsin-Madison 3.0%
University of California-Irvine 3.0%
University of Rochester 2.8%
California Institute of Technology 2.6%
University of Michigan-Ann Arbor 2.6%
Vanderbilt University 2.3%
University of Illinois at Urbana-Champaign 2.0%
University of Missouri-Columbia 1.5%