Changes that increase productivity will shift the average and marginal product curves upward and the average and marginal cost curves downward. 生产率增加会使平均产量和边际常量曲线向上移动，而平均成本和边际成本曲线会向下移动。
Outside China, at any rate, a producer smelts or sinks according to its position on aluminium's cost curve. 无论如何，中国境外的生产者需要根据铝成本曲线的位置点来选择熔炼或者放弃。
