[简答题]It has been found that less than one shopper in five makes a complete shopping list before going to the store. 76)The reason for this is that seven out of ten of today’s purchases are decided in the store, where the shoppers tend toward impulse (冲动) buying. 77)Buying groceries on impulse has risen for the past forty years, and this rise has coincided (重合) with the growth of self-service shopping. However, in grocery stores where clerks wait on customers there is much less impulse buying. 78)It is hard for people to buy on impulse if they have to address a clerk. Psychologists have joined forces with merchandising experts. It is their job to persuade people to buy products which they may not need or even want until they see them attractively presented. It was discovered by the psychologists that shoppers want help in their purchases. 79)Having so many choices confuses them, and they prefer the package that attracts them. Therefore, it is now more usual for food packers to pay attention