If the farmer and rancher choose to be self-sufficient, rather than trade with each other, then each consumes exactly what he or she produces.

如果农夫和牧场主选择自给自足，而非同对方交易，他们每个人的消耗和自己的产出是完全相等的。

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In one scenario, the rancher and the farmer could choose to have nothing to do with each other.

在某个时候，牧场主和农夫可以选择不和对方有任何来往。

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The gains from trade are most obvious if the rancher can produce only meat and the farmer can produce only potatoes.

交易所带来的好处在当牧场主只能生产肉类、农夫只能种土豆的情况下是最为明显的。

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Mr Nordby, a third-generation farmer and rancher, takes a milder line: he believes the big companies are only doing what comes naturally to them.

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"When I was a kid in the '50s ... it got real dry, but nothing like this, " said Marvin Helms, a 70-year-old farmer and rancher in central Arkansas who was compelled to sell his beef cattle after being short on feed.

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"This rule goes too far by ultimately impacting the farmer, the rancher, mineral rights owner, business owner and home developers, " Tisha Schuller, president of the Colorado Oil and Gas Association, an industry group, said in a prepared statement.

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