English, Article, Journal or magazine article edition: How important is selection ? Experimental versus non-experimental measuresof the income gains from migration McKenzie, David; Gibson, John; Stillman, Steven

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Bookmark: http://trove.nla.gov.au/version/117425
Physical Description
  • preprint
Language
  • English

Edition details

Title
  • How important is selection ? Experimental versus non-experimental measuresof the income gains from migration
Author
  • McKenzie, David
  • Gibson, John
  • Stillman, Steven
Physical Description
  • preprint
Notes
  • Measuring the gain in income from migration is complicated by non-random selection of migrants from the general population, making it difficult to obtain an appropriate comparison group of non-migrants. This paper uses a migrant lottery to overcome this problem, providing an experimental measure of the income gains from migration. New Zealand allows a quota of Tongans to immigrate each year with a lottery to choose among the excess number of applicants. A unique survey conducted by the authors in these two countries allows experimental estimates of the income gains from migration by comparing the incomes of migrants to those who applied to migrate, but whose names were not drawn in the lottery, after allowing for the effect of non-compliance among some of those whose names were drawn. The authors also conducted a survey of individuals who did not apply for the lottery. Comparing this non-applicant group with the migrants enables assessment of the degree to which non-experimental methods can provide an unbiased estimate of the income gains from migration. They find evidence of migrants being positively selected in terms of both observed and unobserved skills. As a result, non-experimental methods are found to overstate the gains from migration, by 9 to 82 percent. A good instrumental variable works best, while difference-in-differences and bias-adjusted propensity-score matching also perform comparatively well.
  • Economic Theory&​Research,Regional Governance,Poverty Impact Evaluation,Poverty Monitoring&​Analysis,Inequality
  • RePEc:wbk:wbrwps:3906
Language
  • English
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