Subjects	Variables	Explanation
Farmer		Production cost of agricultural products, represents production cost of signing the keeping fresh contract and not signing the keeping fresh contract respectively. expresses different kinds of agricultural products.
		Effort level to ensure the quality of fresh agricultural products. represents the minimum and maximum level of effort, both in the 0 - 1.
		Wholesale price of agricultural products, represents wholesale price of signing the keeping fresh contract and not signing the keeping fresh contract respectively.
Super- market		Purchase cost of agricultural products, represents purchase cost of signing the keeping fresh contract and not signing the keeping fresh contract respectively.
		The total amount of agricultural products purchased.
		Transportation cost of agricultural products, represents the payment of the cost of transport for logistics company of signing the keeping fresh contract and not signing the keeping fresh contract respectively.
		Sales price of agricultural products, represents the sales price of signing the keeping fresh contract and not signing the keeping fresh contract respectively.
Logistics company		The transportation cost of logistics company.
Logistics company		Effort level to ensure the quality of fresh agricultural products. represents the minimum and maximum level of effort, both in the 0 - 1.
Parameter variable		Fresh level of agricultural products, increasing with,
		Random variables under uncertain conditions.
		Price elasticity of different price.
		Respectively, on behalf of the profit of farmer, supermarket and logistics company in the case of signing the fresh-keeping contract.
Consumer		Random variables under uncertain conditions.
Consumer		Demand function, is related to fresh level of agricultural products.