Burger King and Tim Hortons are struggling with a staffing crunch and the Delta variant keeping coffee-loving office workers at home, causing parent Restaurant Brands International Inc QSR.TO, QSR.N to miss estimates for quarterly revenue on Monday. The central bank is facing increasing pressure to hike interest rates ahead of schedule when it meets on Wednesday, amid hot inflation and a recovering job market in Canada. Demand has jumped for relatively cheap Canadian natural gas, driving exports to the United States to three-year highs and prompting producers in Canada to boost capital spending and drilling activity.