To the spokesmen of "business as usual" this rating of current production under the pressure of war needs may seem extravagantly low; whereas, to the experts in industrial engineering, who are in the habit of arguing in terms of material cost and mechanical output, it will seem extravagantly high. Publicly, and concessively, this latter class will speak of a 25 percent efficiency; in private and confidentially they appear disposed to say that the rating should be nearer to 10 percent than 25.

The Vested Interests and the Common Man (1919)