With more than 26,000 locations nationwide and thousands more around the globe, Subway ranks as the world’s largest restaurant chain. Despite its size, though, the sandwich giant has shown some signs of decline recently. Along with three consecutive years of falling sales (including a 4.4 percent drop in 2017), foot traffic in Subway restaurants has plummeted by 25 percent since 2012. In fact, insiders estimate that as many as one-third of the company’s locations are not profitable.

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