收益递减：随着投入量的增加，每一单位额外投入得到的收益减少的特性。
Diminishing returns are the property whereby the benefit from an extra unit of an input declines as the quantity of the input increases.
学习曲线所描述的是企业累积性产品产量与每一单位产量所需要投入要素数量之间的关系。
Learning curve a graph showing the mathematical relationships between the quantity of firm's accumulative product and that of input to every unit of product.
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