Extensive research has shown that the effects of short-term price promotions on sales are themselves short-term. Companies' hopes that promotions might have a positive aftereffect have not been borne out for reasons that researchers have been able to identify. A price promotion entices only a brand's long-term or "loyal" customers; people seldom buy an unfamiliar brand merely because the price is reduced. They simply avoid paying more than they have to when one of their customary brands is temporarily available at a reduced price. A price promotion does not increase the number of long-term customers of a brand, as it attracts virtually no new customers in the first place. Nor do price promotions have lingering aftereffects for a brand, even negative ones such as damage to a brand's reputation or erosion of customer loyalty, as is often feared.
So why do companies spend so much on price promotions? Clearly price promotions are generally run at a loss, otherwise there would be more of them. And the bigger the increase in sales at promotion prices, the bigger the loss. While short-term price promotions can have legitimate uses, such as reducing excess inventory, it is the recognizable increase in sales that is their main attraction to management, which is therefore reluctant to abandon this strategy despite its effect on the bottom line.
According to the passage, which of the following is the reason why short-term price promotions do not attract new long-term customers to a brand?

定位:A price promotion entices only a brand’s long-term or “loyal” customers; people seldom buy an unfamiliar brand merely because the price is reduced. They simply avoid paying more than they have to when one of their customary brands is temporarily available at a reduced price. A price promotion does not increase the number of long-term customers of a brand, as it attracts virtually no new customers in the first place. Nor do price promotions have lingering aftereffects for a brand, even negative ones such as damage to a brand’s reputation or erosion of customer loyalty, as is often feared.
A 无涉及
B 定位:They simply avoid paying more than they have to when one of their customary brands is temporarily available at a reduced price.客户只是在他们熟悉的品牌在促销的时候,避免出高价。没有提到 regard the promotional price as the fair price and the regular price as excessive.
C 定位:people seldom buy an unfamiliar brand merely because the price is reduced.不太符合
D 正确。同C定位,可以得出客户很少是因为促销才去购买自己不熟悉的品牌的。符合原文
E 无涉及

