How the polar vortex chilled restaurant sales
A look at Technomic data in the Chicago market shows how much the frigid weather hurt traffic.
Technomic Top 500 preview: Sales at country's biggest chains improved in 2018
The largest restaurant concepts proved resilient last year, while Chick-fil-A leapfrogged Burger King and Wendy's to become the fifth-largest chain and Panera Bread joined the top 10.
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