Employees carry delivery bags full of food out of a Shake Shack store in New York January 30, 2015. Shares of hamburger chain Shake Shack Inc soared as much as 150 percent in their first day of trading on Friday, valuing the company that grew out of a hotdog cart in New York's Madison Square Park at nearly $2 billion. REUTERS/Lucas Jackson (UNITED STATES - Tags: BUSINESS FOOD)
SAN FRANCISCO (Reuters) - 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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