Scientific Advertising
Treat advertising as a measurable, testable science.
A foundational 1923 text arguing that advertising should be judged by measurable results, not opinion or art. Hopkins champions testing, tracking, coupons, and sales as the only true measures of an ad's worth. Short and direct, it laid the groundwork for modern direct response and data driven marketing.
Its core idea, that you test, measure, and let data decide, is the foundation of modern growth and performance marketing. Founders running ads and experiments will recognize A/B testing and conversion thinking a century before the tools existed.
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