Total Cost of Ownership
This concept seems to have been developed by The Gartner Group, and is just the sort of thing that budget myrmidons ask awkward questions about, especially in parlous times:
Gartner pioneered the notion of a total cost of ownership (TCO) for technology. TCO takes into account all kinds of costs besides the equipment or software vendor's price. As Gartner has shown over and over, capital costs are often only a small part of the total... (http://www.80211-planet.com/columns/article.php/917751)
A Google search may be instructive, but I can't find any document that is all that relevant to calculating or estimating figures/values for liberal arts uses.