交换是指从他人处取得所需之物,而 以其某种东西作为回报的行为。 Exchange is the act of obtaining a desired product from someone by offering something in return. 交易(Transactions)—交易是交换活动的 基本单元,是由双方之间的价值交换所构 成的行为
效用是消费者对产品满足其需要的整体能 力的评价。 Value is the consumer's estimate of the product's overall capacity to satisfy his or her needs. 消费者通常根据这种对产品价值的主观 评价和要支付的费用来作出购买决定