Shake Shack IPO Doubles

Shake Shack went public today, at a price of $21 per share. Evidently investors were hungry for the stock, as it opened at $47 per share, climbed to $52 per share, before closing at $45.90, an increase of about 119 percent. The company, which began as a hot dog cart in Manhattan, is now worth about $1.6 billion.