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james_davis_nicollOK, how about if in a hypothetical model of population growth and distribution, we include something for net migration based on:
Relative per capita income of nations, on the assumption that people usually move to places where they think they can do better.
[Placeholder: I need a measure of non-economic attractiveness but I can't think of a word for it]
Something modelling the barriers to emigration, by nation.
Something modelling the barriers to immigration, by nation.
I suspect that if you try to model how these change (the fact that nation that is relatively attractive in one century can become much less attractive in the next, or that nations that get lots of immigrants tend to go through pro- and anti-immigrant cycles) it becomes unworkably complex.
Relative per capita income of nations, on the assumption that people usually move to places where they think they can do better.
[Placeholder: I need a measure of non-economic attractiveness but I can't think of a word for it]
Something modelling the barriers to emigration, by nation.
Something modelling the barriers to immigration, by nation.
I suspect that if you try to model how these change (the fact that nation that is relatively attractive in one century can become much less attractive in the next, or that nations that get lots of immigrants tend to go through pro- and anti-immigrant cycles) it becomes unworkably complex.
