When the influence factors of market entry,that is, the sunk cost of entry,demand condition,product difference and entrepreneurship,change from exogenous variables into endogenous variables in the model,the degree of market entry will change accordingly.

• 本文的分析表明 :当市场进入的沉淀成本、需求状况、产品差异化以及企业家能力等这些影响市场进入程度的因素由外生变量变为内生变量时 ,市场进入程度也随之发生改变。