The firms usually conspire on price in the oligopoly markets according to the theory of microeconomics and industry organization, thus forming a par monopoly market.

• 依照微观经济学和产业组织理论,高度集中产业市场中的寡头厂商往往会在价格变量上形成暗中或默契的价格串谋,使产业市场处在一种“准完全垄断”的状态。