An article by Michael Useem, University of Pennsylvania, published in Nonprofit Management and Leadership Volume 1, Issue 4, 2006.
From the abstract: Focusing on funding in culture and the arts, the author identifies a distinctive logic of company support for nonprofit organizations. Business giving is increasingly disciplined around company objectives, giving levels are driven by pretax earnings, and giving decisions are the province of managers who draw advice less from the arts community or public agencies than from other companies. At best, turbulence in government funding has modest effect on corporate support. In turn, change in corporate support has little impact on public backing. The separate logics of corporate and government support imply separate and distinctive long-term development strategies for nonprofit organizations.

http://www3.interscience.wiley.com/cgi-bin/abstract/114031300/ABSTRACT