Shake Shack's IPO price more than doubled today when it opened for public trading. With many pondering and dissecting the successes of fast-casual brands like Shake Shack, and other market leaders such as Chipotle and Five Guys, NPR's The Salt correspondent Yuki Noguchi interviewed restaurant consultants for an article that aired today. Among those interviewed was Synergy's Founder and CEO, Dean Small.Listen (or read) to the end to hear Dean's thoughts on the pressure that Shake Shack will likely feel to grow its operations.Double Shack Shack Shack photo credit: Simon DoggettCC by 2.0