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THE ARITHMETIC OF GROWTH

Written for the people who pay for the work, not the people who do it. Every post ends in a number you can run against your own data.

August 21, 2026

Customer acquisition cost: the formula, and the number that decides where your next dollar goes

Everyone calculates CAC. Almost nobody does the subtraction that comes after it — the one that decides whether your next dollar buys more traffic or a better conversion rate.

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Flamel · 2026