Over the past few decades, many aspects of American life have enlarged. Our cars, commutes, shopping centers, parking lots, portion sizes, pets, and waistlines have all gotten wider, taller, longer, or all three.

The same holds true for private human service organizations, according to University of Michigan researchers David J. Tucker, a professor of social work and sociology, and David H. Sommerfeld, a Ph.D. candidate in social work and sociology. The researchers analyzed how the average...

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