Before Beating McDonald's, Shake Shack Must Get Its Business Model Right

Shake Shack (NYSE:SHAK) is a popular ?fast and casual? franchise. Though slowing, its sales continue to grow at robust rates. That?s in sharp contrast to McDonald?s, which has been reporting sluggish sales for several quarters. But before it beats McDonald?s, Shake Shack must get its business model right. Specifically, the company needs to