I would say that buying sugar at the equator is more profitable as gravitational pull is less at the equator (you can say almost zero) as compared to the poles (where the gravitational pull is the highest) , so sugar will weigh more at the poles than at the equator. Therefore, we can say that the price of sugar will be more at the poles than at the equator. The sugar will WEIGH less at the equator , so the price will also be less there. Hence, buying sugar at the equator is more profitable