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The marginal cost of one additional passenger on an American Airlines flight. Food and beverages Increase in fuel costs Direct labor Advertising expenses The marginal cost of serving one additional customer in a Chipotle Mexican Grill. Food and beverages Advertising expenses Admin expenses Marketing cost The marginal cost of manufacturing one additional Burton snowboard. Fuel cost Direct material Advertising expenses Marketing cost The marginal cost of keeping a Bank of America branch bank open one additional hour on Saturdays. 2 Wages or commission 2 Direct material ? Electricity expenses Advertising expenses The marginal cost of United Airlines adding a flight from Honolulu to Seattle. Aircraft fuel Wages of the flight crew Rent of office building Wages of airport maintenance personnel Food and beverages Manufacturing overhead