A free, self-paced textbook in 6 chapters. Read a chapter, then drill it with the 120 companion flashcards using spaced repetition.
Unit economics is the revenue and costs directly attributable to a single unit of value — a customer, an order, a subscription month, or a contract — used to assess per-unit profit...
Customer Acquisition Cost (CAC) is the fully-loaded cost to acquire one new paying customer — ad spend, sales salaries, tools, and creative, divided by new customers in the period....
A cohort is a group of users sharing a defined start event — for example, customers acquired in January 2025 — tracked over time to measure behavior. Cohort analysis is central to...
A small set of compounding metrics separates efficient growth from capital-hemorrhaging growth. The Burn Multiple, popularized by David Sacks in a 2020 tweet-thread framing it as "...
Recurring-revenue businesses revolve around a few core top-line metrics. Annual Recurring Revenue (ARR) is the annualized value of all recurring contracts at a point in time — the...
Acquisition channels each carry distinct unit-economic profiles. Content and SEO carry high upfront fixed cost with near-zero marginal CAC per lead and long payback — great at scal...