The United Kingdom has the fifth largest national economy (and second largest in Europe) measured by nominal GDP and eighth largest in the world (and second largest in Europe) measured by purchasing power parity (PPP). The UK economy comprises (in descending order of size) the economies of England, Scotland, Wales and Northern Ireland. In 2013 the UK was the fourth largest exporter in the world and the fourth largest importer, and had the second largest stock of inward foreign direct investment and the second largest stock of outward foreign direct investment. The UK is one of the world's most globalised economies

 

http://en.wikipedia.org/wiki/Economy_of_the_United_Kingdom