The optimal combination of benefits and risks is the best combination of benefits and risks. If the benefit is certain, the risk is minimized; Any transaction can be seen as a contract between the two parties. The so-called transaction cost can be seen as the cost of the transaction contract. According to Mr Coase and others, a type of transaction costs arise from the accidental factors that occur when a deal is signed. These incidental factors may not be written into the contract due to the fact that they could not be foreseen in advance, or although they could be foreseen, they could not be written into the contract due to too many factors. Another type of transaction costs is the signing of contracts and the cost of monitoring and enforcing contracts. Brazilian wine institute department manager diego, in thought, although this figure gong sal weiss wines on the fame than neighboring Argentina and Chile, but the Brazilian wine good acidity, crisp, is on the table match food to enjoy. "It's fertile soil," he said. "it's good for the growth of grapes. Compared to Chile and Argentina, we have a higher level of acidity, which is great for food.