أية كلمة؟

التعريف: “The difference between the spot or cash price of a commodity and the price of the nearest futures contract for the same or a related commodity. _____ is usually computed in relation to the futures contract next to expire and may reflect different time periods, product forms, qualities, or locations.”

أول حرف: B

ما هي الكلمة التي يتم تعريفها؟