What is ad effectiveness, and how does it help your business?

‘I know that half of my advertising money is wasted,’ early 20th-century department-store pioneer John Wanamaker famously quipped. ‘I just don’t know which half.’

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source https://searchengineland.com/what-is-ad-effectiveness-and-how-does-it-help-your-business-298922
from RANK And EXPAND YOUR BUSINESS WITH US http://socialmediamarketingconsultantseo.blogspot.com/2018/05/what-is-ad-effectiveness-and-how-does.html

source https://heidiwclinton.tumblr.com/post/174153055037