When they do the comparison, they suppose that costs, selling prices, and market share remain constant.
Therefore, to attack this comparison, we have to show that costs, selling prices, and market share do not remain constant.
(A) It is not about certainty, but about constancy.
(B) Not relevant
(C) Some processes require big investments, and those "some cases" are not important.
(D) Yeah, this is the best answer. Selling prices and market share change!
(E) Not relevant
Auge um Auge, Zahn um Zahn !