As the price of a commodity rises, overall purchasing power decreases (the income effect) and consumers move toward relatively less expensive goods (the substitution effect).
商品的价格提高，整体的购买力下降(收入效应)，消费者转向购买相对价格低的商品(替代效应)。
Ad, namely, is to publicize, to make more people know the quality and function of commodity. It is to use real and persuasive propagation to deliver commodity information to create purchasing power.
广告，顾名思义就是广而告之，让人民从广告中了解商品的性能与功用，它通过具有真实性和说服力的宣传来传达商品信息、说服大众、创造购买力。
Ad, namely, is to publicize, to make more people know the quality and function of commodity. It is to use real and persuasive propagation to deliver commodity information to create purchasing power.
广告，顾名思义就是广而告之，让人民从广告中了解商品的性能与功用，它通过具有真实性和说服力的宣传来传达商品信息、说服大众、创造购买力。
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