交换过程完成后，商品生产者获得价值，消费者获得使用价值。
After exchange, the producer obtains value and the consumer use value.
商品生产者签订远期来避免风险，但合约是双方事项，缺一不可。
Producers of commodities enter into futures contracts to hedge their risk, but need a party to take the other side.
单个商品生产者要实现价值产出最大化，面临多种方法可供选择。
Individual commercial producer has a number of alternative methods to maximize the value output.
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