In-Out Debate: What Britain Really Gets From EU Membership - SPIEGEL ONLINE - News - International

'According to the European Comission, the EU's executive, the single market increased the economic output of all EU member states by €240 billion in 2006. In the same year Günter Verheugen, an EU Commissioner at the time, estimated that companies had to shoulder bureacracy costs totalling some €600 billion -- more than twice the economic benefit. "The EU brings Britain no economic advantages," said Lea.
http://www.spiegel.de/international/europe/a-881813.html