Success breeds success. Anything which alters its environment to enhance increasing production of itself is playing the game of increasing returns. And all large, sustaining systems play the game. The law operates in economics, biology, computer science, and human psychology. Life on Earth alters Earth to beget more life.
Confidence builds confidence.
Order generates more order. Them that has, gets. Grow by chunking. The only way to make a complex system that works is to begin with an simple system that works. Time is needed to let each part test itself against all the others.