Daniel Starch, Principles of Advertising, 1923.

Examples of exaggeration can be found in almost any advertising medium. The use of the superlative is altogether too prevalent. 'The finest,' 'the best,' 'the greatest,' 'the purest,' 'the most economical,' and so on ad infinitum, are hurled at the public everywhere. Surely not all products of the same class can be the best or the finest.