EV是既包含了debt又包含了equity, sales是在支付利息前的收入,我认为这个multiple是匹配的,也就是说,杠杆结构对此倍数是不产生影响的,那么cost structure和operating profit margin都在sales之后,如何对EV/S产生影响呢?如何理解“The differences in EV/S appear to be explained, at least in part, by differences in cost structure as measured by operating profit margin.”