The goods and services that a country produces are not planned by anyone. production is determined by the interaction of supply and demand and signaled to producers through the price system.
一个国家生产的商品和服务不是由任何人计划的；生产是由供求关系决定的，通过价格体系来传递信息。
Price is determined through the interaction of demand and supply.
价格是由供求关系的相互作用决定的。
In perfect competition, the price in the market is set by the interaction of demand and supply.
在完全竞争市场，价格由需求和供给的相互作用来确定。
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