Stripe moved $1.9 trillion in payments last year. That's 1.6% of global GDP. Patrick Collison says the biggest mistake they made in the early years was not building for this from day one. His fix is a framework he calls concentric circles. Your market is a set of rings. The innermost ring is the customer you serve today. The next ring is the slightly larger market you could serve with one expansion. The outer ring is every company your product could theoretically reach. For Stripe in 2011,…