Many recognized that to reach efficient levels of production they needed to adopt a global approach.

Chrysler and Ford are now prosperous because their factories are running at efficient levels.

If investment were lower than the efficient level, so would be the return on deposits.

Motivation is a powerful tool in the work environment that can lead to employees working at their most efficient levels of production.

Countries set their environmental standards below socially efficient levels in order to attract investment or to promote its exports.

Other analysts estimate that companies still need to eliminate about two million more jobs, or 5 percent of the work force, to reach efficient levels.

Bruce Coleman, chief executive of Stamps.com, said the company was trying to get "back to the basics, operating on the most efficient levels."

If that involvement were to continue at its efficient level, no one else could be allowed to know.

If the government has to make a decision on the socially efficient level of pollution anyway, it may be simpler to regulate the quantity directly.

The water system in Tegucigalpa has more than 9 employees per 1,000 connections, which is about three times as high as the estimated efficient level.