This paper examines the determinants of illegal immigration in the United States from Mexico from 1976 to 1995. The main challenge in the empirical work is that the observations are not the number of individuals that attempt to enter the United States illegally, but rather the number of...

The central result of this paper establishes an isomorphism between two types of mathematical structures: ""ternary preorders"" and ""convex topologies."" The former are characterized by reflexivity, symmetry and transitivity conditions, and can be interpreted geometrically as ordered...

We study outsourcing from the United States under the offshore assembly program (OAP). Formerly called the 806/807 provision of the U.S. tariff code, and now renamed the 9802 provision of the Harmonized System code, this program allows U.S. firms to export component parts and have them assembled...