Networks effects can lead to massive, rapid growth. Amazon has leveraged this little sketch by Jeff Bezos in 2001 for mega growth — Amazon calls it a virtuous cycle — and, more recently, the Uber variation, by David Sacks explains much of Uber’s wild ride.
When you build a platform that leverages network effects right it can enable growth way beyond what has historically been possible. Also, see Metcalfe’s Law.
HT: Slava Kremerman