基本解釋[經(jīng)濟(jì)學(xué)]預(yù)期邊際銷(xiāo)售量貢獻(xiàn)專(zhuān)業(yè)釋義經(jīng)濟(jì)學(xué)預(yù)期邊際銷(xiāo)售量貢獻(xiàn)