Zero to One: Notes on Startups, or How to Build the Future · chapter 5 · id zero-to-one-c5-09-branding-alone-cannot-create-a

“Branding alone cannot create a monopoly -- you need substance beneath the brand. Yahoo tried to be a brand-first technology company and failed.”

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Receipts

Yahoo! -- Wikipediasource alive
Yahoo was acquired by Verizon for $4.48 billion in 2017, down from a peak market cap of $125 billion in January 2000. Yahoo lost search to Google, social to Facebook, and email to Gmail despite strong brand recognition.
Interbrand -- Best Global Brandssource alive
Apple, the world's most valuable brand ($502B brand value in 2024), only holds ~25% global smartphone market share despite supreme branding -- proving even the strongest brand doesn't guarantee monopoly.

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