2 responses

  1. Vipul Naik
    March 16, 2013

    There is one point where I would probably put emphasis on a different angle than you have. I have an upcoming blog post on this, but it may take a while, so in the meantime, this comment is my public statement on the matter. You note, correctly, that Goodhart is right to be critical of pro-immigration people (particularly those on the political left) who significantly underestimated the number of people who would migrate under a particular migration policy. You then say that it’s a non sequitur for Goodhart to conclude that they were wrong about the more substantive claim that immigration would not be harmful to natives.

    I think that with something as tricky as open borders, the more subjective claims (such as whether immigration is harmful to natives) are a lot harder to evaluate than the more objective claims (such as how many people might migrate). A neutral observer, without much knowledge of the subject, and with weak priors, would need to first determine who are the credible voices in the debate. Credibility is partly determined by one’s ability to get the easily verifiable objective metrics right, or at any rate, to not get them completely wrong, and to admit uncertainty where there is. People who consistently get the easily verifiable objective metrics right would, from the viewpoint of a neutral observer without strong priors, deserve to be taken more seriously when they make claims about the present or past that are harder to evaluate, or claims about the future, which are de facto hard to judge in the present.

    The “double world GDP” folks have always predicted that huge amounts of migration are likely to occur under open borders policies, and that restrictionist policies are a key reason why migration numbers are low. In contrast, economic determinists have tended to take the view that (to put it very simplistically) migration numbers are determined purely by economic trends and are not too sensitive to migration policy. Within the status quo, economic determinists have a good prediction record because migration policy doesn’t change enough to really test the claim. When we are talking about radical changes to the status quo, however (such as a shift from the pre-1964 US immigration regime with the 1965 Immigration and Nationality Act) the economic determinist-style claims of the “only a few thousand people will migrate” type are woefully wrong.

    It is tempting for open borders advocates to side with the economic determinists and pro-immigration forces predicting low migration numbers, because high numerical predictions regarding migration make the people more likely to oppose migration policies. Unfortunately, this inability to call out low migration numbers in the pro-immigration and economic determinist side has, I think, cost open borders advocates their credibility, both for (i) consistency — the high migration numbers predicted in “double world GDP” models are in stark contrast to the low migration numbers put forward by pro-immigration forces, and (ii) accuracy of predictions and forecasts — when migration numbers turn out to be much higher than forecast, then neutral observers who don’t start with strong priors will discount other more subjective and harder-to-evaluate claims made by open borders advocates.

    This is why I strongly advocate calling out economic determinist arguments and repeatedly pointing out that immigration policy is extremely effective at affecting migration levels.

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