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
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