An official website of the United States government
Here is how you know
The .gov means it's official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information,
make sure you're on a federal government site.
The site is secure.
https:// ensures that you are connecting to the official website and that any
information you provide is encrypted and transmitted securely.
Arthur S. Herman,
John W. Ferris
Productivity gains, aided by new technology, especially computers, but moderated by cyclical downturns, averaged 2.6 percent a year over the 1958-80 period.