Who said, "I know half the money I spend on advertising is wasted. Now, if I only knew which half"?

Question

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This quote is famously attributed to John Wanamaker, a successful American merchant and religious leader in the late 19th and early 20th century. He was known for his innovative marketing techniques and is often considered a pioneer in the field of advertising. The quote reflects the common challenge faced by advertisers in determining the most effective use of their budget, and suggests that even the most successful campaigns may have elements that are not as impactful.

Who Said, "I Know Half the Money I Spend on Advertising