Source GMAT Prep
Manufacturers sometimes discount the price of a product to retailers for a promotion period when the product is advertised to consumers. Such promotions often result in a dramatic increase in amount of product sold by the manufacturers to retailers. Nevertheless, the manufacturers could often make more profit by not holding the promotions.
Which of the following, if true, most strongly supports the claim above about the manufacturers' profit?
(A) The amount of discount generally offered by manufacturers to retailers is carefully calculated to represent the minimum needed to draw consumers' attention to the product.
(B) For many consumer products the period of advertising discounted prices to consumers is about a week, not sufficiently long for consumers to become used to the sale price.
(C) For products that are not newly introduced, the purpose of such promotions is to keep the products in the minds of consumers and to attract consumers who are currently using competing products.
(D) During such a promotion retailers tend to accumulate in their warehouses inventory bought at discount; they then sell much of it later at their regular price.
(E) If a manufacturer falls to offer such promotions but its competitor offers them, that competitor will tend to attract consumers away from the manufacturer's product.
OA is D highlight to reveal
I agree with the OA and understand why OA is correct but I have some concern on how to interpret the question:
We must have the model of Manufacturer --> Retailer --> People in order to support this argument. We need this, otherwise the OA is not correct. If the manufacturers both sell the product DIRECTLY to the consumers (which some manufacturers do in real world, i.e. Coca Cola) and through retailers (i.e supermarket), then the promotion can actually increase their profits despite the fact that the retailers buy as many products as possible during the promotion period and then sell them at retail price as stated in D. In that case, since we don't know any information related to the price and number of units sold in comparison of with-promotion with without-promotion, we can't conclude anything about the profit.
Now, even though one knows the model M --> R --> People, meaning that the profit of the M comes only from the R, one can't still conclude that the M makes less money with-promotion compared to without-promotion for the very same reason: we don't know any information about the number of products sold with-promotion and without-promotion. What if when without-promotion the R buys significantly less product than they do with-promotion? So the MG can still make more money, hence profit, if the number of products sold in the 2 situations greatly differs.
Another question: I'm not a business guy, who do I supposed to know this model M --> R --> People?
Anyone can shed some light please? Thanks a lot.