There are currently several economy systems. Each system based on the structure of the different markets. Therefore, the market of business depends on competitive level, the characteristics of each market influence to buyer and seller’s behavior. Market structure it considered for each type of market structures. Firstly is the amount of buyer-seller. Secondly is in and out of the vendor’s competitive market. Thirdly, it is the types of goods or services. Fourthly, it considered to business size of the venders. This essay will discuss the main characteristics of each market structures in economics system. It also gives a case study of each market structure.