Sylvan Goldman, an American supermarket owner, invented the shopping trolley ( 购物车 ) in the 1930s. The reasons why he invented the trolley was not just to help shoppers carry their shopping, but also to encourage them to buy more. To create the first trolleys, Goldman used folding chairs. He put one basket on the seat, and he raised the chair by putting wheels under the legs. So people could shop with them. But he was disappointed to find that business did not improve. Many shoppers wouldn't like to use the trolleys, because they were afraid they might not be able to control( 控制 ) them. However, Goldman didn't give up his idea because he knew that people could be easily influenced( 受影响的 ). He tried again, and this time his ideas seemed to work. Crowds of people were seen coming from his supermarket with trolleys. Their trolleys were full of goods ( 商品 ). Others, after seeing theme began to believe that the trolleys were safe after all. What they did not know was that they were cheated ( 欺骗 ), Goldman paid those people they saw to act as shoppers happily pushing full trolleys.