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| per unit of population (For instance, it is generally acknowledged that in such occupations as social work, psychiatry, and teaching, the need (expressed in terms of the number of professional workers per unit of population required to meet standards set for services) is greater than the demand (the money available to pay these professional workers) – by John K. Folger, Helen S. Astin, and Alan E. Bayer Tamerlane) | |||