Variable costs are those costs that do change as the firm alters the quantity of output produced 固定成本指的是在短期内不易变动的成本如房屋与机器厂房设备之支出。
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A corporation made up several companies that produce large quantities of output in a variety of industries 诸多产业中，由几家公司组成的股份公司，大量生产各种产品。
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The results show that the rational range of variable output is between the quantity of output when marginal cost is lest of all and the quantity of output which is decided by marginal cost when it equals the expectation price of the product in market 分析结果表明，可变产量的理性产出范围应在最小边际成本所对应的产出量到边际成本与产品的预期价格相等所对应的产出量之间
