Building a Credible Path to $100M ARR: Why Bottom-Up Models Trump TAM in SaaS

Jason Lemkin argues that while TAM (Total Addressable Market) is important, SaaS founders should focus on building data-driven bottom-up models proving they can reach $100M ARR within 7 years. This belief and credible path matter more than entering a large market, as demonstrated by successful companies like Okta, Shopify, and Salesforce that started in seemingly niche segments.