This should be completely self-evident. And yet, the “free trade” crowd will no doubt ignore this empirical evidence, just as they have ignored the last 200 years of the logic:
A shocking report has shown that 160,000 Britons have missed out on jobs over the past ten years because they were taken by foreign labour. The true scale of the link between migration and the dole was revealed today in an independent study by the Migration Advisory Committee (Mac). There are 23 fewer jobs for British workers for every 100 migrants from outside the EU, the Government’s immigration advisers said.
If American labor is replaced at the same rate, then the 37.5 million immigrants since 1980 rendered approximately 8.6 million Americans jobless as of 2006. However, the situation is actually much worse than reported here because it doesn’t account for foreign immigration from within the EU, which accounts for two-thirds of the immigration into the UK. Factoring that in, we can estimate that approximately 25.8 million Americans are presently unemployed due to foreign immigration.
Therefore, it is both empirically and logically obvious that it is the post-1986 mass migration that is at least partly responsible for the wage stagnation and consistent decrease in the employment-population rate that has been occurring since the late 1990s.