As yet the efficiency of selling goods has not been worked out. Most salesmen believe it cannot be done. They claim that there are too many variables in the problem. Perhaps there are, but nobody knows until the experiment has been thoroughly tried. In every case the victories of Efficiency have been won in spite of the most stubborn opposition from the men who were being helped. And one fact is sure - that the first Advertisers and Sales Managers who try out Efficiency and succeed will find themselves in a gold mine. They will have found a better way to enter a market that handles, in an average year, thirty thousand million dollars worth of goods.

p. 7 - Ads and Sales (1911)