Retention is the foundation everything else stands on: without it, acquisition and referral just pour water into a leaky bucket. A flattening retention curve is the clearest proof of product-market fit and the thing that makes every growth loop compound. Fix retention before you spend a rupee on growth.
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The original, still-used test for whether you have product-market fit, from the person who coined 'growth hacking' and grew Dropbox and others.
Concrete retention benchmarks and cohort-analysis methods gathered from dozens of top companies, so you can tell a healthy retention curve from a dying one.