One of the least read parts of The Lean Startup is the chapter on what I call engines of growth. This is my attempt to elucidate what I call the law of sustainable growth, meaning a situation where new customers come as a necessary side effect of the actions of past customers.

Not really related to your question, but Steve recently wrote a great article about the new book that, if you're a fan of his, you might like too: https://steveblank.com/2026/06/09/incorruptible/