Immigration and labour-market outcomes in the United States: a political-economy puzzle
综述文献发现移民对劳动力市场影响很小，并解释劳动经济学家与贸易经济学家对此解读差异源于模型维度假设不同，最后讨论政治经济学含义。
Based on a larger survey of the literature (Gaston and Nelson, 2000), this paper argues: (i) that econometric research uniformly finds very small labour-market effects of immigration; (ii) that labour and trade economists have differed in their interpretation of this finding; and (iii) that this difference is driven exclusively by different dimensionality assumptions (with labour economists preferring a 1-sector x m-factor model and trade economists an n-sector x m-factor model). It is then argued that the trade economists' model, along with its presumption of factor-price insensitivity to immigration is the more useful as a presumption generator. The paper concludes with a discussion of the political-economy implications of these results. Copyright 2000 by Oxford University Press.