在该模型中涉及的五种力量包括：新的竞争对手入侵，替代品的威胁，客户的议价能力，供应商的议价能力以及现存竞争者之间的竞争。
Five kinds of strength involved in the model include : The new rival invades , the threat of the substitute , buyers ' ability of negotiation price , suppliers ' ability of negotiation price and the competition among many competitors .
供应商议价能力