Recent immigration reform proposals, such as Arizona’s SB1070, have focused on curtailing illegal immigration through increased border enforcement and deportation of unauthorized residents. But border enforcement is expensive and often ineffective. In addition, while foreign workers benefit the U.S. economy–whether they’ve entered legally or illegally–they also increase the tax burden on U.S. citizens. In Regulating Low-Skilled Immigration in the United States (AEI Press, 2010), Gordon H. Hanson, director of the Center on Pacific Economies and CCIS Research Associate, outlines principles for immigration reform that will balance these fiscal costs and benefits. Successful reform, he argues, must attract in-demand workers who have strong incentives to assimilate and be economically productive, but will not place excessive demands on public services.