ON ETHICS: Most developed economies have some illegal immigrants. The United States has the largest number: approximately 10 to 11 million. Without legal US identifi cation (ID) documents, they cannot open bank accounts or buy houses. Many US fi rms have targeted this population and accept the ID issued by their native countries when selling them products and services.

Some Americans are furious with these business practices. Other Americans suggest that illegal immigrants represent a growth engine in an economy with relatively little growth elsewhere. How would you participate in this debate?