If q 2 = 0 {\displaystyle q_{2}=0} , then the first firm's residual demand is effectively the market demand, d 1 ( 0 ) = D {\displaystyle d_{1}(0)=D} .
如果 q 2 = 0 {\displaystyle q_{2}=0} ，那么第一家公司的剩余需求是有效的市场需求， d 1 ( 0 ) = D {\displaystyle d_{1}(0)=D} 。