54 .Implications of Electronic Mail and Message Systems for
Figure 9.-Contribution of USPS-Delivered First-Class
Fixed Costs (assuming 2'/0 un
T o 8.
y 6 -Y**
an Y Z
W 1980 contribution
34 X Z -*
SOURCE: Office of Technology Assessment
United States. Congress. Office of Technology Assessment. Implications of Electronic Mail and Message Systems for the U.S. Postal Service. [Washington D.C.]. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc39480/. Accessed April 30, 2016.