Editor’s note: This interview with Marc Andreessen was edited and condensed for clarity from the original conversation, and appears in The High Growth Handbook on scaling companies from 10 to 10,000 by Elad Gil. The full content has been reprinted below, with our own formatting. You can also listen to an a16z Podcast with Gil on the book (and other topics) here. It’s a thrilling thing to build a new product, then watch as consumers actually pick it up. But achieving product/market fit also marks the beginning of a challenging time for a lot of founders.