Successful response rates between various advertising mediums (traditional & new) are still as whole, logistically, unquantifiable. This nice piece courtesy of Entrepreneur.com addresses a basic question. How can you know which of your approaches is earning the best ROI? After a 7 year study and the work up of a 2,500 page book only 3 factors were understood...
http://www.entrepreneur.com/advertising/adcolumnistroyhwilliams/article64738.html
Miles
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