Principles of operation: Theories of international migration

Most citizens and public officials think they understand the mechanics of international migration, of course, or they would not advocate such bold proposals or act with such assured abandon. In the North American case particularly, the reasons for Mexican immigration seem obvious. The prevailing wisdom begins with the commonsense observation that the United States is a rich country and Mexico, by comparison, is not. Although Mexico’s 1997 GNP per capita of $3,700 places it in the upper tier of developing nations, it pales in comparison to the U.S. figure of $29,000., Nowhere else on Earth is there such a sharp contrast along a land border, much less one that is two thousand miles long.