This document discusses using polynomial growth models to gauge startup growth trajectories. It provides examples of Amazon's revenue growth, which was polynomial rather than linear or exponential. The author explains that early growth should come from discovering and saturating different marketing channels. An example is given of their startup's growth from optimizing channels like AdWords, Facebook ads, content marketing, and SEO landing pages. The key takeaways are that marketing is difficult due to many failures, but the mechanics of polynomial growth are easy by testing channels and measuring results.