whAt will hAppEn iF A nEw CompAny oFFErs A proDuCt DiFFErEnt Frgm thosE oF thE Existing Firm
A．monopolistiCAlly CompEtitivE mArkEt.
B．Entry oF morE nEw Firms.
C．thE proDuCt-vAriEty ExtErnAlity.
D．thE BusinEss-stEAling ExtErnAlity.