只有当经济体所运用的内部制度与外部环境、非正式制度相互适应时，才会发挥其最优状态并产生经济效益。
Only when the economy by the use of internal systems and external environment, the informal system of mutual accommodation, the only play to their optimal state and generate economic benefits.
作为房地产企业外部成本的税收，其数额的多少极大地影响着房地产企业的经济效益。
Tax, As real estate enterprise exterior cost, its amount how many is enormously affecting the real estate enterprise's economic efficiency.
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