whAt DoEs A nEw Firm think ABout whEn it ConsiDErs EntEring thE mArkEt with A nEw proDuCt
A．two ExtErnAl EFFECts.
B．thE ExtErnAlitiEs AssoCiAtED with Entry.
C．thE numBEr oF Firms in thE mArkEt.
D．thE proFit it woulD mAk