Though Shake Shack (SHAK) has started expanding on its licensing business opportunity, especially internationally and at airports, the company’s core remains the domestic owned restaurants. These are operating at a healthy operating margin and delivering decent same-store sales ((SSS)) growth. The company’s recent deal with Grubhub (GRUB) seems to be transitioning well operationally, but some volatility is expected in the company's financials from this deal, especially in the coming few quarters. Q4 SSS was guided to come in negative at -3% to -2.5%, despite the company’s push on national and local