The most obvious purpose of advertising is to inform the consumer of available products or services.The second (31)___is to sell the product.The second purpose might be more important to the manufacturers than the (32) ___.The manufacturers go beyond only telling consumers about their products.They also try to persuade customers to buy the(33) ___by creating a desire(34) ___it.Because of advertisement，consumers think that they want something that they do not need.After buying somethin9，the purchaser cannot always explain why it was(35) ___.

　　Even(36) ___—the purchaser probably does not know why he or she bought something，the manufacturers (37) ___.Manufacturers have analyzed the business of(38) ___and buyin9.They know all the different motives that influence a consumer’s purchase--some rational and(39) ___emotional.Furthermore，they take advantage of this(40) ___.

　　Why(41) ___so many products displayed at the checkout counters in grocery stores? The store management has some good(42) ___.By the time the customer is(43) ___to pay for a purchase，he or she has already made rational，thought—out decisions(44) ___what he or she needs and wants to buy.The(45) ___feels that he or she has done a good job of choosing the items.The shopper is especially vulnerable at this point.The(46) ___of candy，chewing gum，and magazines are very attractive.They persuade the purchaser to buy something for emotional，not(47) ___motives.For example，the customer neither needs nor plans to buy candy.but while the customer is standing，waiting to pay money，he or shemay suddenly decide to buy(48) ___.This is exactly(49) ___the store and the manufacturer hope that the customer will(50) ___.The customer follows his or her plan.