Why McDonald's should be afraid of Shake Shack

(Bloomberg) — After more than doubling in its trading debut, Shake Shack Inc. is being valued almost as highly as Facebook Inc. by at least one measure. Shake Shack shares have a price-to-sales ratio of about 15.6, just shy of Facebook's 16.1 and

Shake Shack is known for long lines at its 34 locations in New York, New Jersey, Connecticut, Pennsylvania, Florida, and Massachusetts. The brand has also been expanding domestically (with new locations in Chicago and 

Shake Shack, the little New York burger joint that began 14 years ago in a hot-dog cart, just became a $1.7 billion behemoth. At its stock-market debut Friday morning, an investor burger binge doubled Shake Shack's share price, sending its stock past

NEW YORK (PIX11/AP) — Investors are craving burgers and crinkle-cut fries. Shares of Shake Shack Inc. have more than doubled minutes after they debuted on the stock market debut Friday. The New York-based burger 

Shake Shack's debut is the latest in a string of blockbuster IPOs from trendy restaurant chains that cater to younger and more affluent diners willing to pay a bit more for fresher and higher quality food. Growth-hungry investors are hoping to