George Borjas formalized an econometric model to argue that these people are not necessarily positively self-selected. (10[1])Ottaviano and Peri argued that these people are imperfect substitutes in the labor market, dampening their potential competitive effects. (10[1])In a paper partially titled (10[1])for inequality, David Card found that a supply shock caused by these people had no negative impact on wages (10[1])for low-skilled workers; (10[2]-5[1])Card’s work (10[1])focused on these people in Miami (10[1])from the Mariel (10[2])Boatlift. Geographers may divide these people’s motivations into “push” and “pull” factors. For 10 points, name these people contrasted with natives, who permanently relocate to a new country. ■END■ (10[1])