I’ve argued many times before against the popular view that increased immigration is detrimental to native employment and income. The simple argument about an increase in supply of cheap labor driving down wages and forcing expensive native workers out of the job market is just that: simple, too simple. There’s even evidence that the opposite is true: immigration increases native wages (because it allows native workers to move up the pay scale). But even if immigration did impose a cost on the host country, that wouldn’t be the final argument against immigration, since such a cost could be seen as a form of global redistribution and global justice: improving the lot of the poorest of the world surely justifies imposing a burden on those who have more wealth and who had the good fortune of being born in the “right” part of the world. True, this burden shouldn’t fall on the poorest members of the “right” countries, but if it does that can be corrected by national redistribution.
Still, let’s return to the labor cost argument against immigration. Here’s another piece of evidence that tips the scales yet a bit further against the view that the extremely low cost of immigrant labor results in displacement of low-level native labor. The evidence I want to cite is about internal migration in China, but it’s perfectly possible to use it against arguments favoring restrictions on international migration:
Hundreds of millions of rural migrants have moved into Chinese cities since the early 1990s contributing greatly to economic growth, yet, they are often blamed for reducing urban ‘native’ workers’ employment opportunities, suppressing their wages and increasing pressure on infrastructure and other public facilities. This paper examines the causal relationship between rural-urban migration and urban native workers’ labour market outcomes in Chinese cities. After controlling for the endogeneity problem our results show that rural migrants in urban China have modest positive or zero effects on the average employment and insignificant impact on earnings of urban workers. When we examine the impact on unskilled labours we once again find it to be positive and insignificant. We conjecture that the reason for the lack of adverse effects is due partially to the labour market segregation between the migrants and urban natives, and partially due to the complementarities between the two groups of workers. Further investigation reveals that the increase in migrant inflow is related to the demand expansion and that if the economic growth continues, elimination of labour market segregation may not necessarily lead to an adverse impact of migration on urban native labour market outcomes. (source, source)