Fancy Fast Food Shares Surge in U.S. as Shake Shack Draws Shorts

Investors seem willing to pay just about anything for a better burger. Half a dozen food chains have held piping-hot stock market debuts in the past year to meet a growing appetite for "fast-casual" restaurants catering to younger and more affluent diners willing to pay more for fresher, higher quality fare than they expect to find at traditional fast food places like McDonald's.
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