American diners think Shake Shack offers the worst bang for your buck out of all the chains in the US - with Panera Bread following close on its heels. New data found the two restaurants led a list of eight popular fast-food restaurants where customers felt the meals they were getting did not meet the prices they paid for them.The data, compiled by the investment firm , found Shake Shack costs an average $13.30 per meal, and Panera costs $14.76 on average per meal.
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