The Internal Market as a Legal Concept

What does the 'internal market' mean? The EU is committed to the construction of an internal market, and in this analysis Stephen Weatherill explains that the EU's internal market is an ambiguous legal concept. One may readily suppose that the United Kingdom possesses an internal market. So does Germany, so does France, so does Australia, and Canada, and the United States of America. The European Union aspires to an internal market, but the detailed patterns governing these several internal...