A farmer buys lumber from a sawmill. He pays the mill owner in flour, wine, and butter. The mill owner pays his men with the goods that the farmer brought in. The goods the workers do not need are taken to the general store and traded for other goods, such as coffee, sugar, and cloth.
What type of system of exchange is being used by the farmer and the mill owner?
A.
money
B.
barter
C.
borrowing
D.
credit