Almost no restaurant chain of this era has been as successful as Chipotle Mexican Grill (NYSE: CMG). Founded in the early 1990s by Steve Ells, the burrito chain essentially invented the fast-casual concept and is now worth $37 billion, more than any other restaurant company aside from McDonald's and Starbucks. Average unit volumes will trend higher due to inflation, but Chipotle has also proven its ability to add capacity with the digital side of the business.