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　　In the American economy this mechanism is provided by a priced system a process in which

　　prices rises and fall in response to relative demands of consumers and supplies offered by seller

　　products.

　　在美国经济，这种机制是被一个价格体制所提供，价格上涨和下跌为了反应消费者和供货

　　相对需求的一个进程。