①規(guī)模經(jīng)濟; ②產(chǎn)品差異優(yōu)勢; ③資本需求; ④轉(zhuǎn)換成本; ⑤銷售渠道; ⑥與規(guī)模經(jīng)濟無關(guān)的成本優(yōu)勢。