他提出两个经济增长模型：(1)两时期模型(Two periods Model)。在“两时期模型”中，Lucas采用类似Arrow(1962)、Romer(1986)的单部门模型，将资本区分为物质资本和人力资本两种形式，将劳动划...
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two periods model
两周期模型
以上为机器翻译结果，长、整句建议使用 人工翻译 。
H1-B visas for skilled workers might serve as a model: they can run for two three-year periods, giving both workers and employers time to decide whether they would prefer a permanent arrangement.
ECONOMIST: Managing the market
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