An expanded and lightly regulated guest worker visa program is an essential part of any immigration reform proposal. A guest worker visa program should efficiently link foreign workers with American employers and function with a minimum of government interference. Market forces as well as security, criminal, and health concerns should be the factors that determine which workers acquire visas. A successful guest worker visa would also divert most unauthorized immigration into the legal system, shrink the informal economy, be easily enforceable, support economic growth in the United States, and narrow the government’s role in immigration.