What are we doing wrong?

The European Union has acknowledged that trade has not increased with the introduction of the Eurozone!

"The introduction of the euro has so far failed to boost trade within the European Union, European Monetary Affairs Commissioner Joaquin Almunia said. In a speech, the commissioner said the EU remains a "less integrated trade area than the U.S."" (Wall Street Journal)

But like everyone knows the introduction of the euro had the main purpose to improve trade within the EU.