Metcalfe's Law states that the value of a network is proportional to the square of the number of its connected users (n²). Coined by Robert Metcalfe (co-inventor of Ethernet) in the context of telecommunications, it provides a mathematical basis for understanding why network effects produce such powerful competitive advantages and why network businesses can grow from near-worthless to enormously valuable in a relatively short period.
Network Effects describe the phenomenon where a product or service becomes more valuable as more people use it. Each additional user increases the product's value for all existing users, creating a self-reinforcing growth loop that — once critical mass is achieved — produces durable competitive moats. Understanding network effect types and mechanics is essential for platform strategy, product design, and investment analysis.
Tipping Points describe the threshold at which a system undergoes a sudden, often irreversible, qualitative shift in behavior. Below the tipping point, a system is in one stable state; beyond it, reinforcing dynamics rapidly push it to a different state. Understanding tipping points is critical for predicting viral growth, managing ecosystem collapses, and designing products and policies that don't accidentally cross catastrophic thresholds.