#430 How to Write Ads That Sell

What It Covers

David Senra examines the life and advertising principles of Claude Hopkins — arguably history's greatest copywriter — through his autobiography *My Life in Advertising* and *Scientific Advertising*. Hopkins built his career on relentless work, deep customer psychology, and a handful of repeatable principles that drove measurable sales results across dozens of major brands.

Key Questions Answered

• •Advertising as salesmanship: Hopkins defines all advertising as multiplied salesmanship — every ad should be written as if one specific prospect stands directly in front of you. A mediocre salesman damages a fraction of your business; mediocre advertising damages all of it. Before publishing any ad, ask: would this help a salesman close a sale face-to-face with a real buyer?
• •Headline leverage: Changing only a headline — while keeping the entire ad body identical — can multiply returns five to ten times, according to Hopkins, with Ogilvy later documenting differences as large as nineteen to one. Spend the majority of writing time on the headline. It selects the right reader from the crowd; without it, the best copy never gets read.
• •Tell the process, not just the claim: When Hopkins audited Schlitz Beer — then fifth in market share — he documented their plate-glass cooling rooms, four-stage bottle cleaning, 4,000-foot artesian wells, and six-month aging process. Schlitz considered these steps ordinary. Hopkins ran them as ads. Schlitz jumped to tied-for-first within months. Competitors used identical processes but never told the story.
• •Sell rewards, not prevention: Hopkins made over one million dollars advertising Pepsodent toothpaste by positioning it around beauty and attractive teeth — not cavity prevention. His research showed people act to gain rewards but rarely to avoid future problems. Every ad featured attractive people, never afflicted ones. Campaigns built around fear of disaster consistently underperform campaigns built around aspiration.
• •Samples require earned effort: Unsolicited product samples lose respect and rarely convert. Hopkins found that requiring prospects to actively request a sample — filling out a form, responding to an ad, making contact — dramatically increased conversion rates. The effort signals genuine interest. Estee Lauder applied the same principle: targeted free samples given personally generated reciprocity and word-of-mouth that outperformed paid advertising budgets.
• •Specificity multiplies persuasion: Vague claims like "lowest prices" or "best quality" carry no weight. A clothing retailer stating "my net profit is 3%" proved far more persuasive than any superlative. A razor brand advertising a "78-second shave" outperformed competitors claiming "quick shaves." Actual figures are accepted at face value; generalities are discounted entirely. Replace every broad claim with a concrete, testable, numbered statement.