As Vipul recently noted, one of the biggest questions surrounding open borders is just how many people would move to a new country. The estimates of doubling world GDP rely on this being a very large number. On the other hand, large numbers of immigrants moving to the first world also increase the concerns surrounding political externalities or the overpopulation and environment effects of migration. The number of immigrants who decide to move can potentially have important consequences for good or ill. At the same time precise estimates of how many people might move are likely to be impossible. We should probably expect at best to come to basic estimates.

But one way to help with that is to receive a multitude of informed opinions on the question and thus I come to you dear readers!

Since examining the entire world at once with this question is likely to be extremely complex, let’s use a particular country as an example: Haiti. Let’s get some basic facts about Haiti down as a way of making this task easier. Haiti’s current population is slightly under 10 million people with about a 1% growth rate under current birth/death/migration rates. The country currently has one of the highest emigration rates in the world at 5.5 people out of every 1000 leaving every year. Current income is also one of the world’s lowest with GDP per capita (purchasing power parity) at about $1,300 a year. This helps contribute to Haiti being one of the countries with the highest wage ratios with the US in a paper written by Michael Clemens meaning the potential economic gain to migrants is among the greatest (see page 11). The United States is home to currently over 500,000 Haitians with most in Florida and New York. According to Gallup polls, about a quarter of the adult Haitian population would like to migrate to the United States in particular. That would be about 1.5 million people (including everyone over the age of 15 as “adults” which depending on Gallup’s definition of adult is likely an overestimate, but then not including any children these migrants may wish to bring).

So my question to readers, if the United States were to open its borders tomorrow how many Haitians do you think would come here? Would everyone expressing an interest come or would economic factors stop them? Would the opening of borders increase how many would want to come? If other developed countries were to open their borders how many Haitians would that draw away from coming to the United States? And how much of a difference would at least partially French-speaking countries like France, Belgium, or Canada opening immigration have on drawing Haitians away from the US? Finally, would there be a difference in the amount of Haitian migration if the US opens its borders generally or if the borders are opened for only Haiti in particular? And would this emigration be a solution for Haiti’s numerous problems?