The primary goal of the monetary system to that of the barter system is that it's more efficient in maintaining the transparency and is efficient in the transactions with its partners. Thus is better and is more reliable than the old system of exchange.
in a barter system, it is difficult to determine how much something would cost. If I am raising corn and you are raising cabbage, how much corn equals one head of cabbage? It is difficult to come to fair trade terms. With a monetary system, it is much easier to set a price and make a trade because everyone is using a common trading instrument.
