Shake Shack's growth from a cart to a chain (2001-2015)
Shake Shack began as a single hot dog cart in New York City's Madison Square Park in 2001, added a kiosk in 2004, and grew into a burger chain that went public in 2015.
The kiosk's popularity justified more locations in New York.
One-park success scaled into a global, publicly traded chain.
It shows the upside of a cult food following, though most neighborhood shops, like Silverside, aim for two or three rooms rather than international reach.
