This paper reviews the evidence on the effects of less-skilled immigration to the U.S., and their implications for immigration reform. It begins with a review of the costs of less-skilled immigration, in terms of competition to native-born American workers; and the benefits of such immigration...

Concerns about the polarization of the labor market are widespread. However, countries vary widely in strategies for strengthening jobs at intermediate levels of skill. This paper examines the diversity of approaches to apprenticeship and related training for middle-level occupations. We begin...