Both the United States and the European Union were founded in part because of the need for economic unity. Just as the U.S. Constitution established the dual sovereignty of the states and the federal government, the EU's Founding Treaty also divided competencies between the Community and the...

In Europe, the competence for social security and the right to levy income tax lie with the country of employment in cross-border matters. This has two disadvantages. First, the Employment Principle distorts active persons' choice of place of work. Second, the employment-based regulation of...

In Europe, the competence for social security and the right to levy income tax lie with the country of employment in cross-border matters. This has two disadvantages. First, the Employment Principle distorts active persons' choice of place of work. Second, the employment-based regulation of...