The United States is now admitting nearly one million legal immigrants per year, while the flow of illegal aliens into the country continues to increase steadily. The debate over immigration policy has typically focused on three fundamental questions: How do immigrants peform economically relative to others? What effects do immigrants have on the employment opportunities of other workers? What kind of immigration policy is most beneficial to the host country? This authoritative volume represents a move beyond purely descriptive assessments of labour market consequences toward a more fully developed analysis of economic impacts across the social spectrum. Exploring the broader repercussions of immigration on education, welfare, Social Security and crime, as well as the labour market, these papers assess dimensions not yet taken into account by traditional cost-benefit calculations. This collection offers new insights into the kinds of economic opportunties and outcomes that immigrant populations might expect for themselves and future generations.