The authors argue that demand is a function of income. Groups with different income have different levels of demand, which constitutes the aggregate consumption demand.
笔者认为，需求是收入的函数，收入不同的群体其需求水平也不同，而各收入群体的消费需求即构成总消费需求。
The exploitation and consumption of tour souvenir constitutes a symbol communication system, which is closely related with designer, producer, merchant, consumer macro-economic policy and so on.
旅游纪念品的开发和消费组成了一种符号信息传达系统，与设计者、生产者、经营者、消费者以及宏观政策、经济性等因素密切相关。
The exploitation and consumption of tour souvenir constitutes a symbol communication system, which is closely related with designer, producer, merchant, consumer macro-economic policy and so on.
旅游纪念品的开发和消费组成了一种符号信息传达系统，与设计者、生产者、经营者、消费者以及宏观政策、经济性等因素密切相关。
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