THE LEAKY BUCKET THEORY OF NETWORK EFFECTS
Network effects can create either robust competitive advantages or easily replicable dynamics, depending on how they are structured within a marketplace. The defensibility of these effects hinges on three factors: breadth (geographic reach), depth (supply heterogeneity), and multi-tenanting resistance. Successful platforms like Amazon achieve a deep moat through heterogeneous supply and high supplier retention, while others like "Uber for X" struggle due to their limited scope and weaker supplier loyalty.