Which tasks do we need the European Union for? The short answer is: We need the European Union to produce those public goods that extend beyond the nation state Infrastructure can be such a good. If one country builds a cross-border railway line, its residents benefit from it. But not only theirs: the people in whose country the train route leads, benefit too. Though, since only the benefits of the building country’s population (voters) are regularly included in political decisions, too few cross-border train routes are built.
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