We study the migration policy set by a welfare maximizing government in a model where immigrant workers differ in their skills and are imperfectly matched with heterogenous occupations. The policy fixes a minimum skill level for legal migrants, and foreign workers that fall below it can only...

We develop a general model of legal and illegal immigration to understand the basic tradeoffs faced by a government in the decision to implement an immigration amnesty in the presence of a selective immigration policy. We show that two channels play an important role: an amnesty is more likely...

This paper studies why illegal immigration is widespread. We develop a political agency model in which a politician decides on an immigration target and its enforcement, facing uncertainty on the supply of migrants. Illegal immigration can arise for two reasons: the policy maker may be unable to...

This paper examines ethnicity among highly skilled immigrants to the United States. The paper focuses on five classic components of ethnicity – country of birth, race, skin color, language, and religion – among persons admitted to legal permanent residence in the United States in 2003 in the...

In 2008, approximately 12 million immigrants lived illegally in the United States, and large numbers of undocumented foreigners resided also in other advanced destination countries. Hence, attempts at controlling immigration flows seem to often fail. If governments are not enforcing their...

Despite restrictive migration policies, large numbers of undocumented migrants reside in many destination countries. If official migration targets are not enforced, why are they devised? To address this puzzle, we develop a political agency model with uncertainty on the migrants' supply, where...

This paper estimates the causal effect of the prospect of legal status on the employment outcomes of undocumented immigrants. Our identification strategy exploits a natural experiment provided by the 2002 amnesty program in Italy that introduced an exogenous discontinuity in eligibility based on...

Illegal immigration is a major policy challenge in Europe, in particular in countries on the external border of the EU such as Italy or Spain. However, there are likely to be important effects on the rest of the EU, too, depending on the policies against illegal immigration in border countries....

In recent years there has been a strong political interest about illegal immigrants in Spain. In fact, there have been three regulatory adjustments in the period from 2000 to 2005. However, this effort has not been accompanied by studies that accurately estimate both the size of the irregular...