7/20/2021 By Praveen Paramasivam and Hilary Russ July 20 (Reuters) - Chipotle Mexican Grill Inc beat estimates for comparable quarterly sales on Tuesday but warned that higher beef and freight costs will offset the benefit of menu prices hikes. Restaurants have been plagued by outages of everything from green tea to paper bags, as well as labor shortages, as the U.S. economy has reopened following pandemic-related lockdowns. In the current quarter, commodity costs and staffing shortages at suppliers will mostly cancel out the 3.5% to 4% menu price increase originally implemented to pay for higher wages, Chief Financial Officer Jack Hartung said in a call with