The unprecedented growth of the population has made the supply of enough food a challenge. By understanding this issue, the importance of the agricultural sector can be well received. Agricultural development, without considering sustainability issues, causing problems such as excessive consumption of chemicals and environmental degradation. This issue has led to paying special attention to sustainable agriculture, recently. On the other hand, each supply chain, there needs to be vertical coordination between the supply and demand of the participating factors in that chain. Guaranteed price contracts that are closed between manufacturers and buyers is a kind of vertical coordination that can benefit both parties to the contract.