Notice how fast Chick-fil-A is growing?  Chick-fil-A is now the third largest restaurant chain by system-wide sales. Its ascent has been so rapid that other fast-food brands are taking note of its unique business model.  Popeyes recently launched its own chicken sandwich leading the two brands into a social media war.  But how is it that a restaurant that’s ensnared in controversy, and closed on Sundays, next in line to overtake Starbucks and McDonald’s?

CNBC takes a look at the rise of Chick-fil-A, see it below!

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