The Iroquois traded excess corn and tobacco for the pelts from the tribes to the north and the wampum from the tribes to the east. The Iroquois used present-giving more often than any other mode of exchange. Present-giving reflected the reciprocity in Iroquois society. The exchange would begin with one clan giving another tribe or clan a present with the expectation of some sort of needed commodity being given in return. This form of trade ties to the Iroquois culture's tendency to share property and cooperate in labor. In all cases no explicit agreement is made, but one service is performed for the community or another member of the community's good with the expectation that the community or another individual would give back. External trade offered one of the few opportunities for individual enterprise in Iroquois society. A person who discovered a new trading route had the exclusive right to trade along the same route in the future. Often clans collectivized trading routes to gain a monopoly on a certain type of trade.