I know half the money I spend on advertising is wasted. Now, if I only knew which half.
John Wanamaker
John Wanamaker was an American merchant and religious, civic and political figure, considered by some to be a proponent of advertising and a "pioneer in marketing". He served as United States Postmaster General in the Benjamin Harrison administration from 1889 to 1893.
Quotes
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Half the money I spend on advertising is wasted; the trouble is I don't know which half.