The claim states that manufacturers could often make more profit by not holding promotions, despite the increase in product sold during the promotion period. Let's evaluate each option to determine which one most strongly supports this claim:
(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.
This option does not directly support the claim about manufacturers making more profit without promotions. It discusses the calculation of discounts to attract consumers' attention but does not address the profitability aspect.
(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.
This option weakens the claim. It suggests that the period of advertising discounted prices is short, which means consumers do not have enough time to get accustomed to the lower price. This implies that consumers may be less likely to switch back to the regular price after the promotion ends, potentially leading to higher profits for the manufacturers without promotions.
(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.
This option weakens the claim. It suggests that promotions serve the purpose of keeping products in consumers' minds and attracting those who use competing products. If promotions effectively achieve these goals, they could lead to increased sales and potentially higher profits for the manufacturers.
(D) During such a promotion, retailers tend to accumulate in their warehouses inventory bought at a discount; they then sell much of it later at their regular price.
This option supports the claim. It suggests that during promotions, retailers accumulate inventory bought at a discount and later sell it at the regular price. If manufacturers were not holding promotions, retailers would not be able to accumulate discounted inventory, potentially leading to higher profits for the manufacturers.
(E) If a manufacturer fails to offer such promotions but its competitor offers them, that competitor will tend to attract consumers away from the manufacturer's product.
This option weakens the claim. It suggests that if a manufacturer does not offer promotions while its competitor does, consumers may be attracted to the competitor's product. This implies that promotions can be beneficial for manufacturers in maintaining market share and potentially increasing profit.
Based on the above analysis, option (D) most strongly supports the claim about manufacturers making more profit without promotions. It highlights the practice of retailers accumulating discounted inventory during promotions and later selling it at regular prices, suggesting that manufacturers could potentially make higher profits without holding promotions. Therefore, the correct answer is (D).