"In a monetary union with irreversibly fixed exchange rates the weak would become ever weaker and the strong ever stronger. We would thus experience great tensions in the real economy of Europe. For this reason alone, monetary union without the simultaneous integration in fields like fiscal policy as well as regional and social policy is completely inconceivable... In order to create a European currency, the governments and parliaments of Europe would have to be prepared to transfer sovereign rights to a supranational institution."