As simultaneously consideration of manufacturers, traders and consumers in the market, the traders will purchase goods from the manufacturers and that forms wholesale market. In the next stage, traders sell the goods to consumers, so retail market is formed. As a result, there are two equilibrium in such mechanism, one equilibrium in the merchant market and the other side in the consumer market. Dual equilibrium mechanism is very common in reality. However, microeconomics teaching programs are often focused on one side of equilibrium. On the ground of supply and demand law and profit maximization theory, this paper constructed a model with the simultaneously participation of producers, traders and consumers in the market. In addition, the study also identified two types of equilibrium of this market.