Shake Shack built a $4 billion business as an alternative to fast food, with gourmet cachet and lofty prices. But as it expands, it’s embracing a proven fast-food strategy—drive thru—while trying to preserve its premium branding.

https://www.wsj.com/articles/shake-shackthe-anti-fast-food-chainturns-to-drive-thru-as-it-expands-b73e0c0d