由于劳动力的异质性，不同技能劳动力之间的合作和互补可以获得递增收益。
Owing to the heterogeneity of labors, the cooperation and complementarities between labors with different level of skill would achieve increasing returns.
歧视经济学、人力资本理论、教育筛选理论以及劳动力市场分割理论等都从不同方面论述了劳动力的异质性。
Discrimination economics, human capital theory, screening theory and labor market segmentation theory illustrate the difference in labor force in different aspects.
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