ROI of advertising
Half the money I spend on advertising is wasted, the trouble is I don't know which half.
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Note
Wanamaker was general manager of the items in the United States between 1889 and 1893, is known as the pioneer of marketing and advertising.
With this sentence he captures the essence of the measurability of advertising.
If he were still alive and observed the new digital world probably would change that statement.
Today We can say that in the digital field with a 95% probability we know what works and what does not.
